refactor(@angular/build): align environment option parsing with CLI p… #745

Job	Run time
list	56s
workflow (build-unit-tests)	28s
workflow (devkit-core-tests-rerun)	35s
workflow (devkit-core-tests)	1m 7s
workflow (modules-builder-tests)	30s
workflow (build-cli)	30s
	4m 6s

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