refactor(@angular/cli): implement lazy validation for package manager #2961

Job	Run time
list	21s
workflow (devkit-core-tests)	1m 21s
workflow (build-unit-tests)	2m 38s
workflow (build-cli)	1m 43s
workflow (devkit-core-tests-rerun)	1m 26s
workflow (modules-builder-tests)	2m 6s
	9m 35s

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