[🐛 Bug]: Instrumentation is not called on Next.js v15#930

### next-on-pages environment related information System: Platform: darwin Arch: arm64 Version: Darwin Kernel Version 24.2.0: Fri Dec 6 19:01:59 PST 2024; root:xnu-11215.61.5~2/RELEASE_ARM64_T6000 CPU: (10) arm64 Apple M1 Max Memory: 32 GB Shell: /bin/zsh Package Manager Used: npm (10.9.0) Relevant Packages: @cloudflare/next-on-pages: 1.13.7 vercel: 37.8.0 next: 15.1.3 ### Description I am from GitBook, we use Next.js on Cloudflare using next-on-pages. Here is the [instrumentation.ts](https://github.com/GitbookIO/gitbook/blob/main/packages/gitbook/src/instrumentation.ts) file. I made lot of tests and it seems that `register` in `instrumentation.ts` is not called when running on Cloudflare, also `onRequestError` is not called. ### Reproduction Add `instrumentation.ts`, add a log in the `register` and `onRequestError`, locally you can see the log, on Cloudflare, you don't. ### Pages Deployment Method None ### Pages Deployment ID _No response_ ### Additional Information _No response_ ### Would you like to help? - [ ] Would you like to help fixing this bug?