refactor(@angular/build): switch back to rollup for chunk optimizer #2061

Job	Run time
build-e2e-windows	21s
lint	2m 37s
build	19s
Browser Compatibility Tests	0s
test	0s
publish-snapshots	0s
e2e	0s
e2e-snapshots	0s
e2e-package-managers	-1s
e2e-windows	0s
	3m 16s

Provide feedback