[Bug] multi_scan - Unable to parse unit file when using xcbeautify

New Issue Checklist

[x] Updated fastlane-plugin-test_center to the latest version
[x] I read the README.md
[x] I reviewed the example(s) for the action(s) I am using
[x] I have removed any sensitive data such as passwords, authentication tokens, or anything else I do not want to world to see
[x] I have reviewed the Discussions forum to see my question has already been addressed.

Issue Description

When multi_scan is started and your machine has xcbeautify installed, fastlane will default to xcbeautify instead of xcpretty This is fine, and doesn't cause any issues with multi_scan function until gets to calling the junit_helper (https://github.com/lyndsey-ferguson/fastlane-plugin-test_center/blob/master/lib/fastlane/plugin/test_center/helper/junit_helper.rb#L87) which then fails to initialize.

`xcpretty` generated `junit`

<?xml version='1.0' encoding='UTF-8'?>
<testsuites name='SampleAppTests.xctest' tests='1' failures='0'>
  <testsuite name='SampleAppTests.SampleAppTests' tests='1' failures='0'>
    <testcase classname='SampleAppTests.SampleAppTests' name='testExample' time='0.001'/>
  </testsuite>
</testsuites>

`xcbeautify` generated `junit`

<?xml version="1.0" encoding="UTF-8"?>
<testsuites tests="1" failures="0">
    <testsuite name="SampleAppTests" tests="1" failures="0" skipped="0" time="0.0008810758590698242">
        <properties>
          <property name="Configuration" value="Test Scheme Action"/>
        </properties>
        <testcase classname="SampleAppTests" name="testExample()" time="0.0008810758590698242">
        </testcase>
    </testsuite>
</testsuites>

So...

As you can see the xcbeautify junit file contains some extra properties and with some different values. I haven't had a chance to explore what the root cause is yet, just wanted to capture the issue down, and then explore it more tomorrow, but my gut feeling with it failing on testable_filename = xml_element.parent.parent.attribute('name').value it's because of <testsuites tests="1" failures="0">

If that is the case, I'm not sure if that is fastlane``xcbeautify issue, or fastlane-plugin-test_center issue, but flagging here for now

Complete output when running fastlane, including the stack trace and command used

/Users/alextrott/Developer/github/alextrott/fastlane-plugin-test_center/lib/fastlane/plugin/test_center/helper/junit_helper.rb:87:in `initialize': \e[0;31;49m[!] undefined method `value' for nil:NilClass\e[0m (NoMethodError)
        from /Users/alextrott/Developer/github/alextrott/fastlane-plugin-test_center/lib/fastlane/plugin/test_center/helper/junit_helper.rb:48:in `new'
        from /Users/alextrott/Developer/github/alextrott/fastlane-plugin-test_center/lib/fastlane/plugin/test_center/helper/junit_helper.rb:48:in `block in initialize'
        from /Users/alextrott/.rvm/gems/ruby-3.0.0/gems/rexml-3.2.5/lib/rexml/element.rb:1968:in `block in each'
        from /Users/alextrott/.rvm/gems/ruby-3.0.0/gems/rexml-3.2.5/lib/rexml/xpath.rb:68:in `each'
        from /Users/alextrott/.rvm/gems/ruby-3.0.0/gems/rexml-3.2.5/lib/rexml/xpath.rb:68:in `each'
        from /Users/alextrott/.rvm/gems/ruby-3.0.0/gems/rexml-3.2.5/lib/rexml/element.rb:1968:in `each'
        from /Users/alextrott/Developer/github/alextrott/fastlane-plugin-test_center/lib/fastlane/plugin/test_center/helper/junit_helper.rb:47:in `initialize'
        from /Users/alextrott/Developer/github/alextrott/fastlane-plugin-test_center/lib/fastlane/plugin/test_center/helper/junit_helper.rb:30:in `new'
        from /Users/alextrott/Developer/github/alextrott/fastlane-plugin-test_center/lib/fastlane/plugin/test_center/helper/junit_helper.rb:30:in `block in initialize'
        from /Users/alextrott/.rvm/gems/ruby-3.0.0/gems/rexml-3.2.5/lib/rexml/element.rb:1968:in `block in each'
        from /Users/alextrott/.rvm/gems/ruby-3.0.0/gems/rexml-3.2.5/lib/rexml/xpath.rb:68:in `each'
        from /Users/alextrott/.rvm/gems/ruby-3.0.0/gems/rexml-3.2.5/lib/rexml/xpath.rb:68:in `each'
        from /Users/alextrott/.rvm/gems/ruby-3.0.0/gems/rexml-3.2.5/lib/rexml/element.rb:1968:in `each'
        from /Users/alextrott/Developer/github/alextrott/fastlane-plugin-test_center/lib/fastlane/plugin/test_center/helper/junit_helper.rb:29:in `initialize'
        from /Users/alextrott/Developer/github/alextrott/fastlane-plugin-test_center/lib/fastlane/plugin/test_center/helper/junit_helper.rb:16:in `new'
        from /Users/alextrott/Developer/github/alextrott/fastlane-plugin-test_center/lib/fastlane/plugin/test_center/helper/junit_helper.rb:16:in `block in initialize'
        from /Users/alextrott/.rvm/gems/ruby-3.0.0/gems/rexml-3.2.5/lib/rexml/element.rb:1968:in `block in each'
        from /Users/alextrott/.rvm/gems/ruby-3.0.0/gems/rexml-3.2.5/lib/rexml/xpath.rb:68:in `each'
        from /Users/alextrott/.rvm/gems/ruby-3.0.0/gems/rexml-3.2.5/lib/rexml/xpath.rb:68:in `each'
        from /Users/alextrott/.rvm/gems/ruby-3.0.0/gems/rexml-3.2.5/lib/rexml/element.rb:1968:in `each'
        from /Users/alextrott/Developer/github/alextrott/fastlane-plugin-test_center/lib/fastlane/plugin/test_center/helper/junit_helper.rb:15:in `initialize'
        from /Users/alextrott/Developer/github/alextrott/fastlane-plugin-test_center/lib/fastlane/plugin/test_center/actions/tests_from_junit.rb:5:in `new'
        from /Users/alextrott/Developer/github/alextrott/fastlane-plugin-test_center/lib/fastlane/plugin/test_center/actions/tests_from_junit.rb:5:in `run'
        from /Users/alextrott/Developer/github/alextrott/fastlane/fastlane/lib/fastlane/runner.rb:263:in `block (2 levels) in execute_action'
        from /Users/alextrott/Developer/github/alextrott/fastlane/fastlane/lib/fastlane/actions/actions_helper.rb:69:in `execute_action'
        from /Users/alextrott/Developer/github/alextrott/fastlane/fastlane/lib/fastlane/runner.rb:255:in `block in execute_action'
        from /Users/alextrott/Developer/github/alextrott/fastlane/fastlane/lib/fastlane/runner.rb:229:in `chdir'
        from /Users/alextrott/Developer/github/alextrott/fastlane/fastlane/lib/fastlane/runner.rb:229:in `execute_action'
        from /Users/alextrott/Developer/github/alextrott/fastlane/fastlane/lib/fastlane/runner.rb:157:in `trigger_action_by_name'
        from /Users/alextrott/Developer/github/alextrott/fastlane/fastlane/lib/fastlane/other_action.rb:23:in `method_missing'
        from /Users/alextrott/Developer/github/alextrott/fastlane-plugin-test_center/lib/fastlane/plugin/test_center/actions/multi_scan.rb:148:in `block in run_summary'
        from /Users/alextrott/Developer/github/alextrott/fastlane-plugin-test_center/lib/fastlane/plugin/test_center/actions/multi_scan.rb:147:in `each'
        from /Users/alextrott/Developer/github/alextrott/fastlane-plugin-test_center/lib/fastlane/plugin/test_center/actions/multi_scan.rb:147:in `run_summary'
        from /Users/alextrott/Developer/github/alextrott/fastlane-plugin-test_center/lib/fastlane/plugin/test_center/actions/multi_scan.rb:40:in `run'
        from /Users/alextrott/Developer/github/alextrott/fastlane/fastlane/lib/fastlane/runner.rb:263:in `block (2 levels) in execute_action'
        from /Users/alextrott/Developer/github/alextrott/fastlane/fastlane/lib/fastlane/actions/actions_helper.rb:69:in `execute_action'
        from /Users/alextrott/Developer/github/alextrott/fastlane/fastlane/lib/fastlane/runner.rb:255:in `block in execute_action'
        from /Users/alextrott/Developer/github/alextrott/fastlane/fastlane/lib/fastlane/runner.rb:229:in `chdir'
        from /Users/alextrott/Developer/github/alextrott/fastlane/fastlane/lib/fastlane/runner.rb:229:in `execute_action'
        from /Users/alextrott/Developer/github/alextrott/fastlane/fastlane/lib/fastlane/runner.rb:157:in `trigger_action_by_name'
        from /Users/alextrott/Developer/github/alextrott/fastlane/fastlane/lib/fastlane/fast_file.rb:159:in `method_missing'
        from Fastfile:34:in `block (2 levels) in parsing_binding'
        from /Users/alextrott/Developer/github/alextrott/fastlane/fastlane/lib/fastlane/lane.rb:33:in `call'
        from /Users/alextrott/Developer/github/alextrott/fastlane/fastlane/lib/fastlane/runner.rb:49:in `block in execute'
        from /Users/alextrott/Developer/github/alextrott/fastlane/fastlane/lib/fastlane/runner.rb:45:in `chdir'
        from /Users/alextrott/Developer/github/alextrott/fastlane/fastlane/lib/fastlane/runner.rb:45:in `execute'
        from /Users/alextrott/Developer/github/alextrott/fastlane/fastlane/lib/fastlane/lane_manager.rb:47:in `cruise_lane'
        from /Users/alextrott/Developer/github/alextrott/fastlane/fastlane/lib/fastlane/command_line_handler.rb:36:in `handle'
        from /Users/alextrott/Developer/github/alextrott/fastlane/fastlane/lib/fastlane/commands_generator.rb:110:in `block (2 levels) in run'
        from /Users/alextrott/.rvm/gems/ruby-3.0.0/gems/commander-4.6.0/lib/commander/command.rb:187:in `call'
        from /Users/alextrott/.rvm/gems/ruby-3.0.0/gems/commander-4.6.0/lib/commander/command.rb:157:in `run'
        from /Users/alextrott/.rvm/gems/ruby-3.0.0/gems/commander-4.6.0/lib/commander/runner.rb:444:in `run_active_command'
        from /Users/alextrott/Developer/github/alextrott/fastlane/fastlane_core/lib/fastlane_core/ui/fastlane_runner.rb:124:in `run!'
        from /Users/alextrott/.rvm/gems/ruby-3.0.0/gems/commander-4.6.0/lib/commander/delegates.rb:18:in `run!'
        from /Users/alextrott/Developer/github/alextrott/fastlane/fastlane/lib/fastlane/commands_generator.rb:354:in `run'
        from /Users/alextrott/Developer/github/alextrott/fastlane/fastlane/lib/fastlane/commands_generator.rb:43:in `start'
        from /Users/alextrott/Developer/github/alextrott/fastlane/fastlane/lib/fastlane/cli_tools_distributor.rb:123:in `take_off'
        from /Users/alextrott/Developer/github/alextrott/fastlane/bin/fastlane:23:in `'
        from /Users/alextrott/.rvm/gems/ruby-3.0.0/bin/fastlane:23:in `load'
        from /Users/alextrott/.rvm/gems/ruby-3.0.0/bin/fastlane:23:in `'
        from /Users/alextrott/.rvm/rubies/ruby-3.0.0/lib/ruby/3.0.0/bundler/cli/exec.rb:63:in `load'
        from /Users/alextrott/.rvm/rubies/ruby-3.0.0/lib/ruby/3.0.0/bundler/cli/exec.rb:63:in `kernel_load'
        from /Users/alextrott/.rvm/rubies/ruby-3.0.0/lib/ruby/3.0.0/bundler/cli/exec.rb:28:in `run'
        from /Users/alextrott/.rvm/rubies/ruby-3.0.0/lib/ruby/3.0.0/bundler/cli.rb:497:in `exec'
        from /Users/alextrott/.rvm/rubies/ruby-3.0.0/lib/ruby/3.0.0/bundler/vendor/thor/lib/thor/command.rb:27:in `run'
        from /Users/alextrott/.rvm/rubies/ruby-3.0.0/lib/ruby/3.0.0/bundler/vendor/thor/lib/thor/invocation.rb:127:in `invoke_command'
        from /Users/alextrott/.rvm/rubies/ruby-3.0.0/lib/ruby/3.0.0/bundler/vendor/thor/lib/thor.rb:392:in `dispatch'
        from /Users/alextrott/.rvm/rubies/ruby-3.0.0/lib/ruby/3.0.0/bundler/cli.rb:30:in `dispatch'
        from /Users/alextrott/.rvm/rubies/ruby-3.0.0/lib/ruby/3.0.0/bundler/vendor/thor/lib/thor/base.rb:485:in `start'
        from /Users/alextrott/.rvm/rubies/ruby-3.0.0/lib/ruby/3.0.0/bundler/cli.rb:24:in `start'
        from /Users/alextrott/.rvm/rubies/ruby-3.0.0/lib/ruby/gems/3.0.0/gems/bundler-2.2.3/libexec/bundle:49:in `block in '
        from /Users/alextrott/.rvm/rubies/ruby-3.0.0/lib/ruby/3.0.0/bundler/friendly_errors.rb:130:in `with_friendly_errors'
        from /Users/alextrott/.rvm/rubies/ruby-3.0.0/lib/ruby/gems/3.0.0/gems/bundler-2.2.3/libexec/bundle:37:in `'
        from /Users/alextrott/.rvm/rubies/ruby-3.0.0/bin/bundle:23:in `load'
        from /Users/alextrott/.rvm/rubies/ruby-3.0.0/bin/bundle:23:in `'
        from /Users/alextrott/.rvm/gems/ruby-3.0.0/bin/ruby_executable_hooks:22:in `eval'
        from /Users/alextrott/.rvm/gems/ruby-3.0.0/bin/ruby_executable_hooks:22:in `'

Environment

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lyndsey-ferguson / fastlane-plugin-test_center