refactor(@angular/build): extract shared concurrency, watcher, and st… #4435

Job	Run time
list	33s
workflow (modules-builder-tests)	2m 7s
workflow (build-unit-tests)	2m 30s
workflow (devkit-core-tests-rerun)	1m 47s
workflow (build-cli)	2m 4s
workflow (devkit-core-tests)	1m 37s
	10m 38s

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