Use upstream thumbnail if available

[krysal]

Fixes

Fixes #675 by @stacimc

Description

Sends the URL of the upstream thumbnail to Photon if it's available and it's not from Phylopic (since these are not working currently), so we can get the thumbnail faster and prevent timing out when the image is too big. See this comment from the linked issue for more details on the thumbnail investigation.

Testing Instructions

You can manually set a thumbnail URL from the database for any image and test if it's retrieved from the /thumb endpoint.

Checklist

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[github-actions]

Full-stack documentation: Ready

https://WordPress.github.io/openverse/_preview/898

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[openverse-bot]

Based on the high urgency of this PR, the following reviewers are being gently reminded to review this PR:

@obulat
@dhruvkb
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[sarayourfriend]

LGTM, just one question but not a blocker as I don't think it'll break anything, realistically.

[dhruvkb]

LGTM!