[epic] Video selector redesign

[GresilleSiffle]

Here is the list of all issues we want to address before considering the milestone as done.

• Brainstorm & define work for the video selector redesign
• Create an issue for each ticket defined on Miro
• [back] feat: add the subsamples API #1749
• [front] feat: add the subsample tab with its description in the video selector #1750
• [back] feat: refactor Auto entity selection #1785
• [front] feat: Add a tab for "good short videos"  #1786
• [front] feat: text input of video selector shows default search on Tournesol #1788

Good or under-defined ideas that we decide not to do yet

• Make behaviour of Auto configurable
• The Suggestions tab should return "tutorial" videos for new users
  • feat(back, front): the suggestion API should return "tutorial" videos for new users #1752
• On the comparison page, do we want to simplify the UX/UI related to the user's ratings ?
• If it doesn't overload the UI, we can allow the users to add videos to their rate-later list when their browse the lists of the video selector.
• Do we want an infinite scroll/pagination on the video selector's tabs ?
• [front] feat: Add a random-pick button in each tab of the video selector #1787
  • see the comment Epic: UI Settings page #1277 (comment) and the answers
• [back, front] feat: add a user setting allowing define the order of the video selector's tab #1751
• [front] feat: Adding list configuration locally in the video selector tabs #1789