refactor(@schematics/angular): add trailing comma to generated services #2227

Job	Run time
list	34s
workflow (devkit-core-tests-rerun)	1m 30s
workflow (devkit-core-tests)	1m 18s
workflow (modules-builder-tests)	1m 58s
workflow (build-unit-tests)	2m 22s
workflow (build-cli)	1m 41s
	9m 23s

Provide feedback