fix(@angular/ssr): improve locale handling in app-engine #9077

Job	Run time
build	4m 27s
lint	2m 35s
build-e2e-windows	4m 52s
Browser Compatibility Tests	2m 57s
publish-snapshots	2m 56s
test	2m 57s
e2e-windows (windows-2025, 22, npm, 1)	2m 32s
e2e-windows (windows-2025, 22, npm, 2)	2m 32s
e2e-windows (windows-2025, 22, esbuild, 0)	2m 32s
e2e-windows (windows-2025, 22, esbuild, 3)	2m 33s
e2e-windows (windows-2025, 22, npm, 5)	2m 34s
e2e-windows (windows-2025, 22, esbuild, 2)	2m 32s
e2e-windows (windows-2025, 22, npm, 4)	2m 30s
e2e-windows (windows-2025, 22, npm, 3)	2m 32s
e2e-windows (windows-2025, 22, esbuild, 4)	2m 33s
e2e-windows (windows-2025, 22, npm, 0)	2m 32s
e2e-windows (windows-2025, 22, esbuild, 5)	2m 20s
e2e-windows (windows-2025, 22, esbuild, 1)	2m 33s
e2e-snapshots	1s
e2e	1s
e2e-package-managers	1s
	51m 2s

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