Audit all tests that require WindowsOnlyFact or WindowsOnlyTheory and make them work on linux

[jmarolf]

the WindowsOnlyFact and WindowsOnlyTheory attributes was applied to several tests in #4444 to unblock merging. We should audit the remaining tests and figure out how to enable them again on linux.

• WindowsOnlyFact tests
• WindowsOnlyTheory tests

[Youssef1313]

The failing test for ReleaseTrackingAnalyzer seems like a product bug (not a critical one though).

The fix isn't using consistent line endings. The following constants are using '\r\n':

roslyn-analyzers/src/Microsoft.CodeAnalysis.Analyzers/Core/MetaAnalyzers/Fixers/AnalyzerReleaseTrackingFix.cs

Lines 28 to 32 in b148fa8

	internal const string ShippedAnalyzerReleaseTrackingFileDefaultContent = @"; Shipped analyzer releases
	" + CommonAnalyzerReleaseTrackingContent;
	internal const string UnshippedAnalyzerReleaseTrackingFileDefaultContent = @"; Unshipped analyzer release
	" + CommonAnalyzerReleaseTrackingContent;
	private const string CommonAnalyzerReleaseTrackingContent = @"; https://github.com/dotnet/roslyn-analyzers/blob/master/src/Microsoft.CodeAnalysis.Analyzers/ReleaseTrackingAnalyzers.Help.md

But then, AddOrUpdateEntriesToUnshippedFileAsync uses StringBuilder.AppendLine() which internally uses Environment.NewLine. This might need a fix similar to #4774.

Note: There are "hacky" ways to make tests path without changing in the fixer itself. This shouldn't be done claiming to fix the issue.

[Youssef1313]

Interestingly, release tracking test doesn't actually fail on Linux builds. I was expecting them to fail due to my previous reasoning 😕.