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refactor(@angular/build): extract shared concurrency, watcher, and st… #2462

Job	Run time
list	33s
workflow (build-cli)	42s
workflow (build-unit-tests)	43s
workflow (devkit-core-tests)	41s
workflow (modules-builder-tests)	40s
workflow (devkit-core-tests-rerun)	47s
	4m 6s