Revert "feat: include server assets for Vercel serverless functions"

[eltigerchino]

Reverts #10979 (in case we need to revert it to unblock a pending release)

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[Rich-Harris]

Yeah, I'm afraid I think we need to take another run at this. Merely copying the assets over probably isn't all that useful unless there's a way to actually read them on the server; for that I think we need something like serverAssets described in #11020 (comment). Will take a look at that

[eltigerchino]

Merely copying the assets over probably isn't all that useful unless there's a way to actually read them on the server

It currently works for the Vercel adapter because they get copied to the same path as the Vite resolved URL after building. Should I open a new PR with the changes made from the feedback in #10979 (comment) so the Vercel side can benefit from this in the mean time?

Netlify is a different story as we don't have to copy anything. All assets are already accessible but they live in .netlify/server when deployed. Node is similar, where the Vite resolved path is /_app/immutable/assets/* but our adapter copies the assets to server/_app/immutable/assets/* and the root relative path is inaccurate, so there's a mismatch.

[Rich-Harris]

We need to answer the question 'how do I read from the filesystem in an idiomatic way?' and work backwards from there. Mucking around with things like .netlify/server is no good. I made a start on this in #11647 but I'm not 100% sure if it's the right path