Request: add debug log warning if preserveSymlinks is set to true in vite config

[fnimick]

Describe the problem

When preserveSymlinks is set to true, depending on the resolved node_modules layout, you can end up with sveltekit classes constructed from client code using one symlink that are then handled by the server process running from a separate symlink. This means that instanceof checks fail and internals for handling of error(), redirect() etc all return generic error messages. For a related issue, see: #12139

Supporting running under preserveSymlinks I assume is difficult since the vanilla js operations for determining identity no longer work, but we could at least add a warning in the debug log for this case. I spent multiple hours trying to figure out why my redirects were no longer working, only to realize that resolved symlinks from a previous package update resulted in this issue appearing in my project.

From logging I put inside sveltekit's render_page, with a redirect thrown from a load function:

err: Redirect { status: 307, location: '/' }
err instanceof Redirect: false
err.constructor.name: Redirect

Describe the proposed solution

Vite config handling in https://github.com/sveltejs/kit/blob/main/packages/kit/src/exports/vite/index.js already outputs to the log if there are options set that are overridden by sveltekit. It would be great to have a warning output if preserveSymlinks is set to true to indicate that some sveltekit internal operations such as handling of throwables for http responses may not work in this situation.

Alternatives considered

No response

Importance

would make my life easier

Additional Information

No response