Fix test performance by stopping ongoing progress-bar

[fflaten]

PR Summary

A progress-bar started in ActionPreference.Tests.ps1 is never completed and causes the the progress-bar to be rendered for all remaining tests including other files, killing the performance.

PR Context

Demo command: Start-PSPester -SkipTestToolBuild -Path /workspaces/PowerShell/test/powershell/Language/Scripting/ActionPreference.Tests.ps1, /workspaces/PowerShell/test/powershell/Host/TabCompletion/TabCompletion.Tests.ps1

Before change: 60-70s
After change: 16s

PR Checklist

• PR has a meaningful title
  • Use the present tense and imperative mood when describing your changes
• Summarized changes
• Make sure all .h, .cpp, .cs, .ps1 and .psm1 files have the correct copyright header
• This PR is ready to merge and is not Work in Progress.
  • If the PR is work in progress, please add the prefix WIP: or [ WIP ] to the beginning of the title (the WIP bot will keep its status check at Pending while the prefix is present) and remove the prefix when the PR is ready.
• Breaking changes
  • None
  • OR
  • Experimental feature(s) needed
    • Experimental feature name(s):
• User-facing changes
  • Not Applicable
  • OR
  • Documentation needed
    • Issue filed:
• Testing - New and feature
  • N/A or can only be tested interactively
  • OR
  • Make sure you've added a new test if existing tests do not effectively test the code changed
• Tooling
  • I have considered the user experience from a tooling perspective and don't believe tooling will be impacted.
  • OR
  • I have considered the user experience from a tooling perspective and opened an issue in the relevant tool repository. This may include:
    • Impact on PowerShell Editor Services which is used in the PowerShell extension for VSCode
      (which runs in a different PS Host).
      • Issue filed:
    • Impact on Completions (both in the console and in editors) - one of PowerShell's most powerful features.
      • Issue filed:
    • Impact on PSScriptAnalyzer (which provides linting & formatting in the editor extensions).
      • Issue filed:
    • Impact on EditorSyntax (which provides syntax highlighting with in VSCode, GitHub, and many other editors).
      • Issue filed:

[fflaten]

Related to #17516 ?

[ghost]

🎉v7.3.0-preview.7 has been released which incorporates this pull request.:tada:

Handy links:

• Release Notes