fix(@angular/ssr): unblock route extraction with `withEnabledBlocking… #392

Job	Run time
list	39s
workflow (build-cli)	2m 1s
workflow (modules-builder-tests)	2m 36s
workflow (devkit-core-tests)	1m 56s
workflow (devkit-core-tests-rerun)	2m 5s
workflow (build-unit-tests)	2m 39s
	11m 56s

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