[release/6.0] Move mono.mscordbi subset off the offical build

[steveisok]

Backport of #81917

This isn't in use, so there's no need to build and ship it. Instead, this is being moved to the mono windows x64 public leg.

[steveisok]

@carlossanlop this is a tell-mode change.

[steveisok]

@carlossanlop @mmitche indicated he would like this in may servicing, so it needs promoted to release/6.0 as well.

[carlossanlop]

Retargeting included unexpected commits. I'll close this and request a fresh backport directly to release/6.0.

Edit: That didn't work, the bot found conflicts. Reopened this and force-pushed.

[carlossanlop]

One of the wasm failures has this message:

/datadisks/disk1/work/AE18094F/p/build/WasmApp.targets(209,5): warning : Could not find $(AssemblyName)=.dll in the assemblies to be bundled. [/datadisks/disk1/work/AE18094F/p/wasm-test-runner/WasmTestRunner.proj]
      console.info: Arguments: --run,DllImportSearchPathsTest.dll
      console.debug: MONO_WASM: Initializing mono runtime
      console.debug: MONO_WASM: ICU data archive(s) loaded, disabling invariant mode
      console.debug: mono_wasm_runtime_ready fe00e07a-5519-4dfe-b35a-f867dbaf2e28
      console.info: Initializing.....
      Test Failure: System.ArgumentNullException: Value cannot be null. (Parameter 'path1')
         at System.IO.Path.Combine(String path1, String path2)
         at DllImportSearchPathsTest.get_Subdirectory()
         at DllImportSearchPathsTest.AssemblyDirectory_Found()
         at DllImportSearchPathsTest.Main(String[] args)

I think it's #84724 but the top error message Could not find $(AssemblyName)=.dll in the assemblies to be bundled. is weird, I have not seen it before. @elinor-fung @lewing can you confirm it's the exact same issue?

• Queue: Build Browser wasm Release AllSubsets_Mono_RuntimeTests
• Job result
• Log file

If it's different, let me know so I open a new issue.

[carlossanlop]

Other failures which the known build problem is not linking:

• [6.0] Android test failure: Failed to install mobile app #83422
• IOException running NuGet-Migrations during tests in dotnet CLI first run #80619
• [6.0] GC test failures: Handle collector count overflows or underflows #81383