refactor(@angular/build): extract headless configuration logic into h… #1855

Job	Run time
list	29s
workflow (modules-builder-tests)	29s
workflow (build-cli)	30s
workflow (devkit-core-tests)	28s
workflow (build-unit-tests)	29s
workflow (devkit-core-tests-rerun)	29s
	2m 54s

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