fix(@angular/ssr): add leading slash to well-known non-Angular URLs #9520

Job	Run time
build-e2e-windows	1m 44s
build	1m 42s
lint	1m 33s
Browser Compatibility Tests	1s
publish-snapshots	1s
test	1s
e2e-package-managers	1s
e2e-snapshots	1s
e2e	1s
e2e-windows	1s
	5m 6s

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