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fix(@angular/cli): allow command arguments named `help` #4963

Job	Run time
list	29s
workflow (build-unit-tests)	2m 31s
workflow (devkit-core-tests)	1m 26s
workflow (build-cli)	1m 48s
workflow (modules-builder-tests)	1m 42s
workflow (devkit-core-tests-rerun)	1m 30s
	9m 26s