Fix: export_published_chart correctly detects and exports tar file

[svteb]

Description

Removed file globbing as it caused errors and added a new function that will detect a specific tgz file to be untared. Removed the line: FileUtils.rm_rf(tgz_name) as it did not work previously and now that globbing has been fixed it would cause undesired behavior (honestly I was not able to figure out why it is there at all).

Issues:

Refs: #1947

How has this been tested:

• [x] Covered by existing integration testing
• [ ] Added integration testing to cover
• [ ] Verified all A/C passes
  • [ ] develop
  • [ ] master
  • [ ] tag/other branch
• [x] Test environment
  • [ ] Shared Packet K8s cluster
  • [ ] New Packet K8s cluster
  • [ ] Kind cluster
  • [x] Minikube cluster
• [ ] Have not tested

Types of changes:

• [x] Bug fix (non-breaking change which fixes an issue)
• [ ] New feature (non-breaking change which adds functionality)
• [ ] Breaking change (fix or feature that would cause existing functionality to not work as expected)
• [ ] Documentation update

Checklist:

Documentation

• [ ] My change requires a change to the documentation.
• [ ] I have updated the documentation accordingly.
• [x] No updates required.

Code Review

• [x] Does the test handle fatal exceptions, ie. rescue block

Issue

• [x] Tasks in issue are checked off

[svteb]

Comments from @martin-mat were correct in pointing out some unhandled cases/lack of information provided. I've come to understand the intentions behind FileUtils.rm_rf(tgz_name) and decided to bring it back:

unless input_file && !input_file.empty?
      files_to_delete = Dir.glob("#{Helm.chart_name(helm_chart)}-*.tgz") ~> addition
      files_to_delete.each do |file|
        FileUtils.rm(file)
        puts "Deleted: #{file}"
      end ~> end of addition

      helm_info = Helm.pull(helm_chart) 
      unless helm_info[:status].success?
        puts "Helm pull error".colorize(:red)
        raise "Helm pull error"
      end
end

It was necessary to do it like this because FileUtils.rm_rf does not work with file globbing which was originally present. This addition also removed the necessity of checking for state where multiple versions of some helm archive were present (as they get deleted and the newest one gets pulled subsequentially).

Another mistake from the previous commit, that was undiscovered, was the necessity of moving this entire block before the block where tgz archive is being discovered, as the Helm.pull(helm_chart) command is what downloads the tgz archive. This also makes the sequence of steps somewhat more logical:

helm_pull -> discover_tgz -> extract_tgz whereas the previous sequence was discover_tgz -> helm_pull -> extract_tgz.

Furthermore I added an exception that prints better information in case no tgz file is discovered.