Add video blob viewer

What does this MR do and why?

Adds a video blob viewer to the frontend.

Changes in this MR is part of a bigger effort to refactor the blob viewer

Screenshots or screen recordings

How to set up and validate locally

This feature is behind the :refactor_blob_viewer feature flag.

1. run rails c in the project root
2. run Feature.enable(:refactor_blob_viewer) in the rails console
3. upload a video to a repository
4. view the video

MR acceptance checklist

This checklist encourages us to confirm any changes have been analyzed to reduce risks in quality, performance, reliability, security, and maintainability.

• I have evaluated the MR acceptance checklist for this MR.

Related to #324319 (closed)