refactor: source best practices from `@angular/core` #2479

Job	Run time
list	26s
workflow (modules-builder-tests)	1m 50s
workflow (devkit-core-tests)	1m 23s
workflow (build-unit-tests)	2m 24s
workflow (build-cli)	1m 37s
workflow (devkit-core-tests-rerun)	1m 26s
	9m 6s

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