feat(@angular/build): add experimental vitest unit-testing support #953

Job	Run time
list	34s
workflow (devkit-core-tests)	1m 17s
workflow (modules-builder-tests)	1m 49s
workflow (build-unit-tests)	2m 13s
workflow (build-cli)	1m 30s
workflow (devkit-core-tests-rerun)	1m 17s
	8m 40s

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