refactor(@angular/build): add option to dump unit test build output #1892

Job	Run time
list	24s
workflow (build-unit-tests)	2m 31s
workflow (modules-builder-tests)	1m 53s
workflow (build-cli)	1m 39s
workflow (devkit-core-tests-rerun)	1m 31s
workflow (devkit-core-tests)	1m 26s
	9m 24s

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