### What
When users're using nextjs server API that break the build, and error
with incorrect client components usage.
Instrument should be treated as server components or server-only build
target, instead of being treated as client components.
### How
We added a new layer `instrument` for instrument hook bundling, and
apply it with the rsc server webpack loaders
Fixes#57563
Closes NEXT-2181
Closes NEXT-1994
## What?
While looking into some refactors for `next build` I noticed that
`NextBuildContext` was used to propagate if instrumentation.js exists or
not, however that information can be inferred by checking if the
entrypoint exists in the compiler. Applied that change.
I've updated the test fixtures to include the `next.config.js` so that
you can run them using `pnpm next`.
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Closes NEXT-1931
