## Issue
Closes 5923 video metadata issues
## Notes
For thumbnails, future claims should have correct thumbnails after `5925 Fix thumbnail-checking and block 'data:image'`. For existing claims, we'll just skip the metadata to avoid the crawler error. Users can easily update their thumbnails.
For the `OlivOliv` thumbnail url case, I wasn't sure whether to go all out to fetch and verify each thumbnail. I ended up just checking whether it starts with `http(s)`
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