Improve error message when using API command with non-remote registry. #7239
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If you try to use an API command (publish, yank, search, etc.) with a source replacement active (like cargo-vendor or cargo-local-registry), then you get a really weird "failed to fetch" error. This adds a specific check to provide a slightly nicer error.
I'm not entirely happy with the wording, but I think it gets the point across.