refactor(@angular/build): remove Angular packages from externals for … #2253

Job	Run time
list	30s
workflow (modules-builder-tests)	1m 52s
workflow (devkit-core-tests)	1m 23s
workflow (build-cli)	1m 33s
workflow (devkit-core-tests-rerun)	1m 25s
workflow (build-unit-tests)	2m 5s
	8m 48s

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