next.js

3efa21aa - Turbopack: Skip manifest loading in server when using route modules (#82903)

Turbopack: Skip manifest loading in server when using route modules (#82903) ## What? When using Turbopack we'd try to load these files even when they don't exist, which adds latency because of the retrying. This PR ensures the files are skipped from loading where possible, which moves the place where it starts loading the manifest to the route modules instead. The exception to this is the static generation steps as those don't rely on route modules yet. This is something still being worked on.