refactor(@angular/build): extract headless configuration logic into h… #3358

Job	Run time
list	27s
workflow (devkit-core-tests)	1m 29s
workflow (build-unit-tests)	2m 29s
workflow (devkit-core-tests-rerun)	1m 38s
workflow (modules-builder-tests)	1m 57s
workflow (build-cli)	1m 53s
	9m 53s

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