[Security Solution] Failed Test Reporter can not find junit reports in case of failed tests

[maximpn]

Summary

While using Flaky tests runner I've noticed it stopped showing failing tests summary. It turned Failed Test Reporter fails with an error

Run Failed Test Reporter | 6s
-- | --
  | info Searching for reports at [
  | '/var/lib/buildkite-agent/builds/kb-n2-4-spot-42da4b2860c23dc6/elastic/kibana-flaky-test-suite-runner/kibana/target/junit/**/*.xml'
  | ]
  | ERROR Unable to find any junit reports with patterns [/var/lib/buildkite-agent/builds/kb-n2-4-spot-42da4b2860c23dc6/elastic/kibana-flaky-test-suite-runner/kibana/target/junit/**/*.xml]

while it's not a case for successful test runs.

[elasticmachine]

Pinging @elastic/security-solution (Team: SecuritySolution)