Use upstream thumbnail if available

[krysal]

Fixes

Fixes WordPress/openverse#675 by @stacimc

Description

Sends the URL of the upstream thumbnail to Photon if available, so we can get the thumbnail faster and prevent timing out in some extreme cases.

The code change itself is pretty simple but I'm having a hard time testing this automatically so any help in this regard is welcome here. Maybe someone can observe something I'm missing or come up with a better idea.

Testing Instructions

To manually test this you can pick any image from the database that has a thumbnail (applies for Flickr and Stocksnap) and compare the result of the http://localhost:50280/v1/images/<identifier>/thumb/ endpoint to its url. Observe the difference in sizes. On the main branch, you will get the same image.

Checklist

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• [ ] I added or updated documentation (if applicable).
• [x] I tried running the project locally and verified that there are no visible errors.

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