Create multi job helix project to support multiple test modes on CI

[steveisok]

As discussed in #35568 (review), we need to construct a multi job helix project that calls into sendtohelix.proj with different variables and in parallel.

A good example for this approach would be the mono interpreter. Since it is built within every mono runtime, it can be enabled with the --interpreter parameter. It would be wasteful of CI resources to do this independently of a regular mono test run, so shuffling different parameters into sendtohelix.proj would do the trick.

On the yml side, we would need to trigger the multi job helix project:

runtime/eng/pipelines/libraries/helix.yml

Lines 15 to 28 in 993db61

	steps:
	- script: ${{ parameters.msbuildScript }}
	$(Build.SourcesDirectory)/src/libraries/sendtohelix.proj
	/t:test
	/p:RuntimeFlavor=${{ parameters.runtimeFlavor }}
	/p:TargetArchitecture=${{ parameters.archGroup }}
	/p:Configuration=${{ parameters.configuration }}
	/p:TargetOS=${{ parameters.targetOS }}
	/p:TestScope=${{ parameters.testScope }}
	/p:TestRunNamePrefixSuffix=${{ parameters.testRunNamePrefixSuffix }}
	/p:HelixBuild=$(Build.BuildNumber)
	/p:Creator=${{ parameters.creator }}
	${{ parameters.extraHelixArguments }}
	/bl:$(Build.SourcesDirectory)/artifacts/log/$(_BuildConfig)/SendToHelix.binlog

And then within the multi job helix project, we would shuffle different parameters to sendtohelix.proj as it exists today.

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[ViktorHofer]

I believe the tracking work is already implemented. cc @safern

[safern]

The work to achieve this is already implemented, however we still need to move interpreter leg to the regular leg and use that mechanism still.

[steveisok]

/cc @directhex

[ViktorHofer]

@steveisok moving to infrastructure-mono as the remaining work is updating the interpreter leg to use the new mechanism.

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