refactor(@angular/build): extract shared concurrency, watcher, and st… #4436

Job	Run time
list	38s
workflow (devkit-core-tests)	1m 26s
workflow (build-unit-tests)	2m 32s
workflow (modules-builder-tests)	1m 55s
workflow (devkit-core-tests-rerun)	1m 29s
workflow (build-cli)	1m 46s
	9m 46s

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