~Due to the entry preloading that was enabled by default in #65289, VS
Code is no longer able to map symbols correctly for production builds.
As a temporary solution, we can disable the preloading when a debugger
is started until a proper fix is found.~
By optionally building the Next.js source code with
`NEXT_SERVER_EVAL_SOURCE_MAPS=1` we can ensure, even with the bundled
next server in the node runtime, that the original names are shown in
the debug "Variables" section.
In addition, the `sourceMapPathOverrides` are improved to cover the
different variations of source mapping URLs. We can now also set
breakpoints in the `example/...` and `test/e2e/...` server components.
~Supersedes #66229~
#### Before
<img width="1276" alt="Screenshot 2024-05-27 at 21 36 52"
src="https://github.com/vercel/next.js/assets/761683/f2840c35-f683-445d-bc95-cac9f719d8e7">
#### After
<img width="1276" alt="Screenshot 2024-05-27 at 21 38 42"
src="https://github.com/vercel/next.js/assets/761683/c801c123-3163-46c3-b442-5b72c0a5d51d">
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