fix(@angular/build): provide direct debugging support for unit test b… #1124

Job	Run time
list	31s
workflow (build-cli)	1m 40s
workflow (modules-builder-tests)	1m 54s
workflow (devkit-core-tests)	1m 13s
workflow (devkit-core-tests-rerun)	1m 17s
workflow (build-unit-tests)	2m 17s
	8m 52s

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