refactor(@angular/build): automatically enable headless mode in CI fo… #1997

Job	Run time
list	26s
workflow (build-unit-tests)	2m 32s
workflow (devkit-core-tests-rerun)	1m 23s
workflow (devkit-core-tests)	1m 30s
workflow (build-cli)	1m 39s
workflow (modules-builder-tests)	1m 48s
	9m 18s

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