refactor(@angular/build): breakdown Karma application initialization #1864

Job	Run time
list	25s
workflow (build-cli)	1m 39s
workflow (modules-builder-tests)	1m 44s
workflow (devkit-core-tests-rerun)	1m 32s
workflow (build-unit-tests)	2m 23s
workflow (devkit-core-tests)	1m 28s
	9m 11s

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