Prevent thumbnail timeout

[dhruvkb]

Fixes

Fixes #695 by @AetherUnbound

Description

This PR prevents thumbnail errors from causing server crashes by

• increasing timeout to 10s
• catching more known exceptions
• catching all unknown exceptions

Testing Instructions

0. Check out the PR and run the dev server.
1. Try generating thumbnails for many many images.
2. You should not encounter any uncaught exceptions.

Checklist

• My pull request has a descriptive title (not a vague title like Update index.md).
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• I added or updated tests for the changes I made (if applicable).
• I added or updated documentation (if applicable).
• I tried running the project locally and verified that there are no visible errors.

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[obulat]

Nice for debugging in the future :)

[obulat]

I tried getting 10 thumbnails using a python script, and all returned 200 :)

[AetherUnbound]

Looks great, thank you!