report error when using "use server" on module level (#47967)
### What?
Add a error message when using "use server".
* https://github.com/vercel/turbo/pull/4477 <!-- Tobias Koppers - add
ServerDirective transform which reports unsupported -->
### Why?
Turbopack doesn't support "use server" yet.
### Other turbopack updates
* https://github.com/vercel/turbo/pull/4464 <!-- Justin Ridgewell -
Better dotenv error messages -->
* https://github.com/vercel/turbo/pull/4485 <!-- Justin Ridgewell - Add
ServerAddr::hostname method -->