Arena.ai rejects python files during upload

[esolment]

The arena.ai server in Agent mode rejects Python files.

Steps to reproduce

1. Go to arena.ai Agent mode.
2. Click the attachment button (Add files)
3. Try to upload a source code file (e.g., script.py).
4. See the message:
   script.py is not a supported file type. Allowed: image/png, image/webp, image/jpeg, image/gif, text/plain, text/markdown, text/csv, text/html, text/xml, text/css, text/javascript, application/json, application/xml, application/javascript, application/pdf