fix: strip internal data before passing URL to reroute

[teemingc]

fixes #11625

This PR ensures that the /__data.json suffix, x-sveltekit-trailing-slash, and x-sveltekit-invalidated query param are stripped before passing a copy of the URL to reroute so that the URL can be correctly rerouted instead of causing a 404 due to the /__data.json pathname suffix.

If this PR gets merged, we will need a shared solution for the edge middlewares running reroute in #12296

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[dummdidumm]

If this PR gets merged, we will need a shared solution for the edge middlewares running reroute in #12296

To clarify: If we merge this, then we need to adjust the referenced PR to also deal with this case, but it's not something that forces our hand in other places?

[teemingc]

If this PR gets merged, we will need a shared solution for the edge middlewares running reroute in #12296

To clarify: If we merge this, then we need to adjust the referenced PR to also deal with this case, but it's not something that forces our hand in other places?

We'd probably need to make the same adjustment if we need to run reroute in other places too. For now, it's only the Vercel and Netlify adapters that have to run reroute earlier to route to the correct split function. I don't think there are other adapters that would need the same changes since only Vercel and Netlify have the split option.

[Rich-Harris]

preview: https://svelte-dev-git-preview-kit-13092-svelte.vercel.app/

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