[Wasm] Add AOT CI Leg

[steveisok]

Contributes to #46633

With the EnableAggressiveTrimming flag added in #46367, the library testing size has been reduced to a much smaller size (~2MB), making AOT compilation of these library tests more reasonable. This PR stands-up a lane on CI to see how far wasm AOT library tests can go.

A significant number of library tests have failed on CI. Most of them have failed because they do not include Microsoft.DotNet.RemoteExecutor, which had been added to https://github.com/dotnet/runtime/blob/master/eng/testing/ILLink.Descriptor.xunit.xml due to a linker bug dotnet/linker#1713.

The failures in the lane have been parsed out to the following test suites that are missing Microsoft.DotNet.RemoteExecutor.

The test suites above have been re-ran locally with the exclusion of Microsoft.DotNet.RemoteExecutor to verify whether the test fails or passes, and suites continuing to fail have been added to project exclusions in tests.proj. A significant number of test suites fall under several categories of failures, but for simplicity, they are listed under just one, and issues have been created for each unique failure.

In lieu of running all the library tests suites in AOT mode on CI (estimated to be ~36 hrs = 240 test suites * ~9min AOT time per test suite), only System.Buffers.Tests.csproj will be ran in AOT mode to standup the leg. In the meantime, alternative solutions are being worked on.

The CI lane will be located in runtime-staging.yml to avoid blocking and failing builds.

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Issue Details

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Author:	steveisok
Assignees:	-
Labels:	arch-wasm, area-Infrastructure-mono
Milestone:	-

[safern]

I would suggest adding this to runtime-staging once this is ready to be merged (I know we're on early process gathering info on how many tests fail, etc) to get it stable.

[mdh1418]

The lane passed after running just System.Buffers.Tests.csproj :)
https://dev.azure.com/dnceng/public/_build/results?buildId=948229&view=logs&j=f217f715-90ad-5404-53bd-b93e3b80f465&t=9df76bd4-3041-5537-002b-9e29a53263b9
Moved the block to runtime-staging.yml

[MichalStrehovsky]

@steveisok Btw, the $(MSBuildThisFileDirectory)System.Buffer.Tests directory doesn't exist, so this is not testing anything.

Suggested change

	<ProjectExclusions Remove="$(MSBuildThisFileDirectory)System.Buffer.Tests\tests\System.Buffer.Tests.csproj" />
	<ProjectExclusions Remove="$(MSBuildThisFileDirectory)System.Buffer\tests\System.Buffer.Tests.csproj" />

[mdh1418]

Thanks for the catch! There is more work being done in #48226 that removes this line, and later the exclusions will be revisited and updated according to this tracking issue #48079.