fix(@schematics/angular): improve VS Code background compilation star… #2714

Job	Run time
list	23s
workflow (build-unit-tests)	2m 22s
workflow (devkit-core-tests-rerun)	1m 16s
workflow (modules-builder-tests)	1m 45s
workflow (build-cli)	1m 40s
workflow (devkit-core-tests)	1m 19s
	8m 45s

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