Don't report to Sentry when polling for uploaded images

When an image is uploaded, the client polls the media-api to check when it has been successfully ingested. This is triggering an error that is being reported to Sentry. We should catch the error and avoid reporting to Sentry as it is the expected behaviour. It also seems to be flooding Sentry, resulting in a "too many requests" error.

Start by locating the client code that polls the media-api after an image upload and identify where polling errors are sent to Sentry. Reproduce or inspect the polling failure, then verify that the expected ingestion error is handled without a Sentry report and that unrelated errors remain reportable.

Written by the indexing model from the issue text.