perf(@angular/build): fix memory leak in `ng serve` with i18n #1696

Job	Run time
list	2m 23s
workflow (build-cli)	34s
workflow (devkit-core-tests-rerun)	39s
workflow (modules-builder-tests)	25s
workflow (devkit-core-tests)	1m 48s
workflow (build-unit-tests)	29s
	6m 18s

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