refactor(@angular/build): remove unneeded babel import attributes syn… #827

Job	Run time
list	25s
workflow (build-cli)	1m 25s
workflow (modules-builder-tests)	1m 39s
workflow (devkit-core-tests)	1m 8s
workflow (devkit-core-tests-rerun)	1m 25s
workflow (build-unit-tests)	2m 16s
	8m 18s

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