refactor(@angular/build): extract headless configuration logic into h… #3357

Job	Run time
list	29s
workflow (build-unit-tests)	2m 33s
workflow (modules-builder-tests)	1m 52s
workflow (build-cli)	1m 51s
workflow (devkit-core-tests)	1m 19s
workflow (devkit-core-tests-rerun)	1m 40s
	9m 44s

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