Temporary disable file upload in OpenAI

[amureki]

We need to migrate the logic: https://platform.openai.com/docs/assistants/migration/what-has-changed

But this takes a bit more time.

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 57.14%. Comparing base (c1f95d9) to head (8234a9a).

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #51 +/- ## ======================================= Coverage 57.14% 57.14% ======================================= Files 10 10 Lines 357 357 ======================================= Hits 204 204 Misses 153 153 ```

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