refactor(@angular/cli): introduce Host abstraction for `find_examples… #9383

Job	Run time
build	32s
lint	41s
build-e2e-windows	40s
Browser Compatibility Tests	1s
publish-snapshots	1s
test	1s
e2e	1s
e2e-package-managers	1s
e2e-snapshots	1s
e2e-windows	1s
	2m 0s

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