refactor(@angular/cli): remove unused load ESM helper #1528

Job	Run time
list	28s
workflow (modules-builder-tests)	1m 39s
workflow (build-cli)	1m 36s
workflow (build-unit-tests)	2m 12s
workflow (devkit-core-tests)	1m 14s
workflow (devkit-core-tests-rerun)	1m 20s
	8m 29s

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