fix(@schematics/angular): remove unused spec tsconfig outDir #3921

Job	Run time
list	29s
workflow (devkit-core-tests)	1m 27s
workflow (build-cli)	1m 48s
workflow (modules-builder-tests)	2m 25s
workflow (devkit-core-tests-rerun)	1m 36s
workflow (build-unit-tests)	2m 28s
	10m 13s

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