Remove sentry exception capture for thumbnail errors

[AetherUnbound]

Fixes

Fixes #3708 by @AetherUnbound

Description

This PR removes the Sentry-shipping of errors that occur in thumbnails on the API. It also removes settings related to that effect.

Testing Instructions

1. Check out this branch and add the following diff:

diff --git a/api/api/utils/image_proxy/__init__.py b/api/api/utils/image_proxy/__init__.py
index af8cd65c7..37c85a080 100644
--- a/api/api/utils/image_proxy/__init__.py
+++ b/api/api/utils/image_proxy/__init__.py
@@ -162,6 +162,7 @@ async def get(
 
     try:
         session = await get_aiohttp_session()
+        raise ValueError("Whoops!")
 
         upstream_response = await session.get(
             upstream_url,

2. Add the SENTRY_DSN environment variable to point to Sentry.
3. Run just api/init and then navigate to http://localhost:50270/v1/images/5c173952-6a45-4380-b9e4-c935263730ab/thumb/
4. Observe the error
5. Run just docker/cache/cli -n 3, then KEYS thumbnail_error:builtins.ValueError* and observe that a key is present in the tally database
6. Observe that no Sentry alert has been raised

Checklist

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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.
• I ran the DAG documentation generator (if applicable).

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[dhruvkb]

I have some suggestions but the PR works fine as it is, so I won't block.

[openverse-bot]

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

@sarayourfriend
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[sarayourfriend]

Ditto to Dhruv's comments. I'll approve with the changes to remove the unused code, but the test change is a non-blocker for me.

[sarayourfriend]

Oops, meant to request changes for the unused code cleanup from Dhruv's comment.

[sarayourfriend]

LGTM!