fix(@schematics/angular): safely comment out multiline statements in … #3713

Job	Run time
list	26s
workflow (build-unit-tests)	2m 22s
workflow (devkit-core-tests-rerun)	1m 23s
workflow (build-cli)	1m 31s
workflow (devkit-core-tests)	1m 19s
workflow (modules-builder-tests)	1m 53s
	8m 54s

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