refactor(@angular/cli): exclude Cnpm from LOCKFILE_NAMES type #1936

Job	Run time
lint	2m 21s
build	18s
build-e2e-windows	19s
publish-snapshots	0s
test	0s
e2e	0s
e2e-package-managers	0s
e2e-snapshots	0s
Browser Compatibility Tests	0s
e2e-windows	0s
	2m 58s

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