Microsoft.Interop.SourceGeneration gets built twice (with a potential of a race)

[ViktorHofer]

  installer.tasks -> C:\git\runtime4\artifacts\bin\installer.tasks\Debug\net10.0\installer.tasks.dll
  Crossgen2Tasks -> C:\git\runtime4\artifacts\bin\Crossgen2Tasks\Debug\net10.0\Crossgen2Tasks.dll
  Microsoft.Interop.SourceGeneration -> C:\git\runtime4\artifacts\bin\Microsoft.Interop.SourceGeneration\Debug\netstandard2.0\Microsoft.Interop.SourceGeneration.dll
  DownlevelLibraryImportGenerator -> C:\git\runtime4\artifacts\bin\DownlevelLibraryImportGenerator\Debug\netstandard2.0\Microsoft.Interop.LibraryImportGenerator.Downle
  vel.dll
  installer.tasks -> C:\git\runtime4\artifacts\bin\installer.tasks\Debug\net472\installer.tasks.dll
  ILLink.RoslynAnalyzer -> C:\git\runtime4\artifacts\bin\ILLink.RoslynAnalyzer\Debug\netstandard2.0\ILLink.RoslynAnalyzer.dll
  ILLink.CodeFixProvider -> C:\git\runtime4\artifacts\bin\ILLink.CodeFixProvider\Debug\netstandard2.0\ILLink.CodeFixProvider.dll
  Mono.Linker -> C:\git\runtime4\artifacts\bin\Mono.Linker\ref\Debug\net10.0\illink.dll
  Mono.Linker -> C:\git\runtime4\artifacts\bin\Mono.Linker\Debug\net10.0\illink.dll
  ILLink.Tasks -> C:\git\runtime4\artifacts\bin\ILLink.Tasks\Debug\net\ILLink.Tasks.dll
  System.Private.CoreLib.Generators -> C:\git\runtime4\artifacts\bin\System.Private.CoreLib.Generators\Debug\netstandard2.0\System.Private.CoreLib.Generators.dll
  System.Private.CoreLib -> C:\git\runtime4\artifacts\bin\System.Private.CoreLib\ref\Debug\net10.0\System.Private.CoreLib.dll
  Microsoft.Interop.SourceGeneration -> C:\git\runtime4\artifacts\bin\Microsoft.Interop.SourceGeneration\Debug\netstandard2.0\Microsoft.Interop.SourceGeneration.dll
  LibraryImportGenerator -> C:\git\runtime4\artifacts\bin\LibraryImportGenerator\Debug\netstandard2.0\Microsoft.Interop.LibraryImportGenerator.dll

and the build then later yet again builds the DownlevelLibraryImportGenerator project:

  BUILD: Product binaries are available at C:\git\runtime4\artifacts\bin\coreclr\linux.x64.Debug\x64
  runincontext -> C:\git\runtime4\artifacts\bin\coreclr\windows.x64.Debug\runincontext.dll
  tieringtest -> C:\git\runtime4\artifacts\bin\coreclr\windows.x64.Debug\tieringtest.dll
  DownlevelLibraryImportGenerator -> C:\git\runtime4\artifacts\bin\DownlevelLibraryImportGenerator\Debug\netstandard2.0\Microsoft.Interop.LibraryImportGenerator.Downle
  vel.dll
  ILCompiler.TypeSystem -> C:\git\runtime4\artifacts\bin\ILCompiler.TypeSystem\x64\Debug\ILCompiler.TypeSystem.dll

cc @jkoritzinsky

[dotnet-policy-service]

Tagging subscribers to this area: @dotnet/interop-contrib
See info in area-owners.md if you want to be subscribed.