fix(@angular/cli): simplify Angular version compatibility checks and … #2738

Job	Run time
lint	1m 57s
build	21s
build-e2e-windows	31s
publish-snapshots	0s
test	-1s
Browser Compatibility Tests	-1s
e2e-snapshots	-1s
e2e	-1s
e2e-package-managers	-1s
e2e-windows	0s
	2m 44s

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