refactor(@angular/cli): Improve zoneless migration prompts based on o… #840

Job	Run time
list	19s
workflow (build-cli)	23s
workflow (modules-builder-tests)	26s
workflow (devkit-core-tests-rerun)	24s
workflow (build-unit-tests)	27s
workflow (devkit-core-tests)	21s
	2m 20s

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