refactor(metadata-route): extract make_route_entry_source helper, sim… #103666

Job	Run time
deploy-target	16s
publish-turbopack-npm-packages	0s
generate-native-matrix	3s
build	3m 24s
build-wasm (web)	1m 46s
build-wasm (nodejs)	1m 41s
stable - x86_64-unknown-linux-gnu - node@20	5m 29s
Deploy examples	-1s
Deploy preview tarball	3m 2s
thank you, build	3s
Potentially publish release	0s
Upload Turbopack Bytesize metrics to Datadog	0s
	15m 43s

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