fix(@angular/cli): batch Prettier invocations during migration format… #3946

Job	Run time
list	27s
workflow (devkit-core-tests)	1m 53s
workflow (build-unit-tests)	2m 32s
workflow (build-cli)	2m 11s
workflow (devkit-core-tests-rerun)	1m 43s
workflow (modules-builder-tests)	2m 20s
	11m 6s

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