fix(@schematics/angular): improve VS Code background compilation star… #2510

Job	Run time
build-e2e-windows	20s
lint	2m 3s
build	28s
e2e-windows	-1s
test	0s
Browser Compatibility Tests	0s
publish-snapshots	0s
e2e-snapshots	0s
e2e-package-managers	0s
e2e	-1s
	2m 49s

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