fix(@schematics/angular): add missing imports for lifecycle hooks in … #2550

Job	Run time
list	28s
workflow (build-cli)	1m 42s
workflow (build-unit-tests)	2m 23s
workflow (devkit-core-tests)	1m 24s
workflow (devkit-core-tests-rerun)	1m 19s
workflow (modules-builder-tests)	1m 50s
	9m 6s

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