refactor(@angular/build): switch back to rollup for chunk optimizer #2009

Job	Run time
list	37s
workflow (build-cli)	1m 38s
workflow (devkit-core-tests-rerun)	1m 31s
workflow (build-unit-tests)	2m 16s
workflow (devkit-core-tests)	1m 18s
workflow (modules-builder-tests)	1m 48s
	9m 8s

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