refactor(@schematics/angular): add trailing comma to generated services #2228

Job	Run time
list	25s
workflow (build-cli)	1m 52s
workflow (build-unit-tests)	2m 29s
workflow (devkit-core-tests)	1m 33s
workflow (modules-builder-tests)	1m 56s
workflow (devkit-core-tests-rerun)	1m 36s
	9m 51s

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