refactor(schematics): use utilities provided by @schematics/angular/u… #757

Job	Run time
build-and-test / build	4m 48s
build-and-test / aot	4m 4s
build-and-test / e2e (1, 2)	6m 15s
build-and-test / e2e (2, 2)	6m 42s
build-and-test / test	4m 57s
build-and-test / coverage	12s
build-and-test / documentation	3m 48s
build-and-test / e2e-merge-reports	23s
build-and-test / preview	0s
publish-documentation	32s
	31m 41s

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