CoreClr build should restore all components up-front

[ViktorHofer]

The "build native test components" step failed to restore components after the entire CoreClr product was built: https://dev.azure.com/dnceng/public/_build/results?buildId=1211659&view=logs&jobId=55b384d0-d6b0-5894-fd8a-d754d713246e&j=388cb898-bfbc-5d7d-00fc-4978afab125f&t=618e4245-b55d-5aa1-bf6d-da73532744e4.

Restoring all CoreClr build components up-front allows NuGet to either fail early or not at all. Also it enables NuGet to optimize the restore as it can batch requests together.

cc @trylek @jkoritzinsky @hoyosjs

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Issue Details

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The "build native test components" step failed to restore components after the entire CoreClr product was built: https://dev.azure.com/dnceng/public/_build/results?buildId=1211659&view=logs&jobId=55b384d0-d6b0-5894-fd8a-d754d713246e&j=388cb898-bfbc-5d7d-00fc-4978afab125f&t=618e4245-b55d-5aa1-bf6d-da73532744e4.

Restoring all CoreClr build components up-front allows NuGet to either fail early or not at all. Also it enables NuGet to optimize the restore as it can batch requests together.

cc @trylek @jkoritzinsky @hoyosjs

Author:	ViktorHofer
Assignees:	-
Labels:	area-Infrastructure-coreclr
Milestone:	-

[hoyosjs]

This will probably be included in the grouping and restores. That being said, it's unlikely this will be the same restore entry as the main managed build.

[ViktorHofer]

Why can't this be part of the overall restore?

[hoyosjs]

We could, I am just warry of having two entry points - one for build-tests and one from the proj itself. There's an initiative to consolidate tests, once that happens I'd be less warry. Right now we do batching maneuvers to fight msbuild issues scaling to the obnoxious number of tests we have. Once that is in, we could easily have a traversal project and then it would be easy to batch restore.

[ViktorHofer]

Sounds good. But apart from the runtime tests there are other components that don't restore up-front which shouldn't be blocked by the runtime tests grouping initiative.

[hoyosjs]

@ViktorHofer do you know which ones?