Sorting pinned threads (Follow-up)

What does this MR do?

Reverts the change to sort pinned threads by name, because the feedback wasn't fully positive. Replaces that with a new system for sorting threads by allowing them to set a wider range of stickyness values (-1 to 10).

How confident are you it won't break things if deployed?

Quite confident. We might need feedback on the addition of the option the move threads to the bottom.

Links to related issues

Solves some part of #1351, since Threads can be moved out of the way.

Screenshots (if applicable)

Icon for marking threads with stickiness -1:

Checklist

• added a test, or explain why one is not needed/possible...
• no unrelated changes
• asked someone for a code review
• set a "for:" label to indicate who will be affected by this change
• added to the next milestone (see https://gitlab.com/foodsharing-dev/foodsharing/-/milestones, unless it has a "for:Dev" label)
• added an entry to CHANGELOG.md
• added a short text in the release notes to /release-notes/YYYY-MM.md
• Once your MR has been merged, you are responsible to create a testing issue in the Beta Testing forum: https://foodsharing.de/region?bid=734&sub=forum. Please change the MRs label to "state:Beta testing".
  • Consider writing a detailed description in German.
  • Describe in a few sentences, what should be tested from a user perspective.
  • Also mention different settings (e.g. different browsers, roles, ...) how this change can be tested.
  • Be aware, that also non technical people should understand.