Figure out up-to-date failures

[brettfo]

I turned off the up-to-date check in #10094 because it's been flaky. Just so we don't loose the information gathered, it seems to always be the following assemblies:

• D:\a\1\s\artifacts\bin\FSharp.Compiler.UnitTests\Release\net472\CSharp_Analysis.dll
• D:\a\1\s\artifacts\bin\FSharp.Compiler.Service.Tests\Release\net472\CSharp_Analysis.dll
• D:\a\1\s\artifacts\bin\FSharp.Compiler.UnitTests\Release\netcoreapp3.1\FSharp.Compiler.UnitTests.dll
• D:\a\1\s\artifacts\bin\FSharp.Compiler.Service.Tests\Release\net472\FSharp.Compiler.Service.Tests.dll
• D:\a\1\s\artifacts\bin\FSharp.Compiler.UnitTests\Release\netcoreapp3.1\CSharp_Analysis.dll
• D:\a\1\s\artifacts\bin\FSharp.Compiler.UnitTests\Release\net472\FSharp.Compiler.UnitTests.dll

Edit: #10135 will remove the CSharp_Analysis project which only leaves one real culprit.

[dsyme]

😢 would love to have this check back, I don't want to suffer rebuilds again :-)