fix(@angular/ssr): improve locale handling in app-engine #2296

Job	Run time
list	24s
workflow (devkit-core-tests-rerun)	1m 21s
workflow (build-cli)	1m 44s
workflow (modules-builder-tests)	2m 0s
workflow (build-unit-tests)	2m 23s
workflow (devkit-core-tests)	1m 26s
	9m 18s

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