Optimize video & thumbnail display performance

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Large video files on issues or merge requests, create increased error rates on Gitlab Workhorse

• Whenever users open the issues or MRs, the browsers (Chrome) tries to prefetch a portion of the file and create a thumbnail and cache.
• And whenever users play them

This is a corrective action for the gitlab-com/gl-infra/production#16284 (closed)

Investigate:

1. Investigate browser video handling and how to optimize it supported browsers
2. Avoid prefetch or thumbnail generation for videos in supported browsers
3. Investigate video formats, and which ones are better for our users. This may lead to a file extension filter feature, to help admins to restrict the types of video files to upload.