MosaicML API is either down or removed

[pmeier]

First test failure observed here: https://github.com/Quansight/ragna/actions/runs/8594065268/job/23546541544?pr=380

I cannot find any documentation about their API anymore. Maybe it was removed? We need to look into this and potentially remove the assistants.

[smokestacklightnin]

The REST API does, indeed, seem to have disappeared. I have searched for any updated version, and haven't found any sort of Mosaic ML REST API currently published. It also doesn't seem easily available from Hugging Face.