Revert "[turbopack] Add bundling support for worker_threads" (#88725)
Reverts vercel/next.js#87746
because of this build error:
```
> Build error occurred
Error: Turbopack build failed with 1 errors:
./node_modules/.pnpm/thread-stream@3.1.0/node_modules/thread-stream/index.js
non-evaluatable module
Worker thread module must be evaluatable
```