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refactor(@angular/build): extract shared concurrency, watcher, and st… #3532

Job	Run time
build	29s
build-e2e-windows	29s
lint	2m 5s
Browser Compatibility Tests	0s
publish-snapshots	0s
test	0s
e2e-snapshots	0s
e2e	0s
e2e-package-managers	0s
e2e-windows	-1s
	3m 2s