Internal error `Error while generating embeddings` on wrong url about meilisearch

[dureuill]

As InternalError is going to get us bug reports, a quick fix could be to switch most embedder errors to UserErrors.

The defaults would need to be switched in this From impl

For a longer term fix, see #4620

[dureuill]

Hello,

it is expected that there is an error here. The input URL is wrong, so the operation cannot be expected to complete.

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It is unexpected that the error is an internal error. It is unclear what kind of error it should be, probably a UserError?

The issue here could come from either:

1. The user typing the wrong URL. OK for a UserError
2. The network is down. Unclear what the error kind should be in the current error scheme.