refactor: change typechecking validation action to output gorup

[jbedard]

This way tsc is not forced to always run as a validation action in the background and instead invoked only when the *_typecheck test is run.

Currently this only effects the noEmit case.

In the future this will allow the isolatedDeclarations fast-path to avoid running type-checking at all unless bazel test is run. This way something such as ibazel run //devserver will not be blocked waiting for the validation action to run in the background.

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Test plan

• Covered by existing test cases

[aspect-workflows[bot]]

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