CppUnitTestFramework is being included in linux .NET SDK

[eerhardt]

Describe the bug

The Linux .NET SDK is including a bunch of native Windows .dll files:

These assemblies all have the Product Name of Microsoft Windows Operating System, which is a weird product name for assemblies we are installing onto Linux machines.

I'm also not sure what the license is for these assemblies. I'm not sure if they meet the MIT License that we ship the linux .NET SDK under.

To Reproduce

Download and extract the latest .NET linux-x64 SDK. Look at the files being included. It shouldn't contain native assemblies that are compiled for Windows.

cc @dsplaisted @marcpopMSFT @richlander

Further technical details

I'm not sure if or how this affects source-build. These assemblies don't show where they are built from, so I don't know if we are building these assemblies during source-build or not. cc @MichaelSimons

[dotnet-issue-labeler]

I couldn't figure out the best area label to add to this issue. If you have write-permissions please help me learn by adding exactly one area label.

[crummel]

Source-build doesn't currently ship 6.0.3xx but this would definitely be a problem if we do so in the future. Poisoning should catch this problem after we start building 6.0.3xx but it's good to know in advance.

[eerhardt]

I looked back and these assemblies weren't present in 6.0.100 but are in 6.0.300, and are in main/7.0.

[richlander]

It seems like we should enable source-build for newer SDK versions even if we no-one is consuming them. These dependencies look bad. We need a way to avoid that. Sourcebuild seems like our best tool for that.

it's good to know in advance

It'd say it is necessary. This is a P1 problem, not P3.

@MichaelSimons -- can you get this on the schedule for .NET Tactics?

[MichaelSimons]

These aren't built/included in source-build therefore it wouldn't catch these today. The unified build project feels like it would have the potential to help surface these types of issues where source-build is the only open build.

[marcpopMSFT]

@pavelhorak @nohwnd as these come from the vstest repo.