Warn if user tries to upload a parquet file to a model repo #2403
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Little QoL suggested by @coyotte508 on slack.
We've had several users reporting that they've pushed their dataset to a model repo. It is then impossible to convert the repo to dataset on the Hub, forcing them to entirely re-upload everything. This PR tries to prevent this kind of mistake by raising a warning when user does upload an arrow or a parquet file to a non-dataset repo. If the user don't stop the process, the files are still correctly uploaded since we don't want to forbid the upload.