Remove Write-Host from PRTest.ps1

[Trenly]

Checklist for Pull Requests

• Have you signed the Contributor License Agreement?
• Is there a linked Issue?

According to ScriptAnalyzer, Write-Host should be avoided because it may not work in all hosts, does not work when there is no host, and (prior to PS 5.0) cannot be suppressed, captured, ore redirected.

This PR updates PRTest.ps1 with the following changes -

• Replaces Write-Host with Write-Error for error messages
• Replaces Write-Host with Write-Information elsewhere
• Adds debug and verbose messages
• Adds VirtualTerminal support for retaining coloring used by Write-Host
• Gets full diff of manifests instead of just the latest commit
• Uses explicit casting rather than checking the variable type returned by the diff

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cc @denelon / @mdanish-kh

Microsoft Reviewers: Open in CodeFlow

[wingetbot]

   

[mdanish-kh]

@denelon - This looks good to go