Followup to Arcade conversion

[JunTaoLuo]

Follow up items for #7280:

• Arcade does not have support doing a 'dry run' of microbenchmarks projects during the 'Test' phase. See https://github.com/aspnet/BuildTools/blob/803fd176f1ae147aa8af08e49e76ffda7221a4cd/files/KoreBuild/modules/benchmarks/module.targets#L14-L37 for the korebuild implementation
  • Tracked in Micro benchmarks don't run anymore #7886
• Ensure the servicing attribute is set correctly on assemblies: cref Missing [assembly: AssemblyMetadata("Serviceable", "True")] arcade#1526
  • Tracked in Ensure the servicing attribute is set correctly on assemblies #18930
• Arcade does not have a good way to specify signcheck exclusions SignValidationExclusionList does not work arcade#2888 (Edit, there seems to be a way to do this in stages so we should be unblocked here)

These probably don't need to be address right away, or at all.

• Need to find a replacement for API check
• Need to find a replacement for NuGet Package Verifier
  • Tracked in Find replacement for NuGet Package Verifier #18931

[Pilchie]

@aspnet/build Should this still be in the 3.1 milestone?

[dougbu]

@Pilchie it should either

1. Not be in a milestone at all because we track it using https://github.com/orgs/aspnet/projects/2
2. In a 3.1.x milestone based on our feeling of urgency. My opinion is this isn't urgent but I also suspect we'll find more bullets (I just checked one off) are already done.

[JunTaoLuo]

Tracking action items separately.