fix(server-hmr): re-require metadata route handlers per-request in Tu… #103665

Job	Run time
deploy-target	20s
publish-turbopack-npm-packages	-1s
build	3m 26s
build-wasm (nodejs)	1m 44s
generate-native-matrix	3s
build-wasm (web)	1m 58s
stable - x86_64-unknown-linux-gnu - node@20	4m 48s
Deploy examples	-1s
thank you, build	3s
Deploy preview tarball	2m 56s
Potentially publish release	0s
Upload Turbopack Bytesize metrics to Datadog	0s
	15m 16s

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