fix(@schematics/angular): add missing imports for focus and skip APIs… #2989

Job	Run time
build-e2e-windows	23s
lint	2m 6s
build	25s
e2e-windows	-1s
publish-snapshots	0s
Browser Compatibility Tests	0s
test	0s
e2e	-1s
e2e-package-managers	-1s
e2e-snapshots	-1s
	2m 50s

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