fix(@angular/build): warn when vitest watch config conflicts with bui… #10065

Job	Run time
build	19s
build-e2e-windows	20s
lint	19s
test	1s
Browser Compatibility Tests	1s
publish-snapshots	1s
e2e	1s
e2e-snapshots	1s
e2e-package-managers	1s
e2e-windows	1s
	1m 5s

Provide feedback