bug: Hub Download Model should show error message when HuggingFace CDN is down

[dan-jan]

Describe the bug

To Reproduce Steps to reproduce the behavior:

1. Go to Hub
2. Download Phi-2-3b or Mixtral
3. Sometimes, the CDN for Huggingface will error out in the console
4. User sees a confusing state, where the Download keeps stopping for no reason

We likely need to show the correct error message to the user if the HuggingFace CDN is not down/not working.

Long-term we should probably provide a mirror or alternative file download to HuggingFace.

Expected behavior A clear and concise description of what you expected to happen.

Screenshots

Desktop (please complete the following information):

• OS: Mac OSX, 16gb RAM
• Version 0.4.3