Add method for cleaning up non-high scores

[peppy]

ie. scores with preserve = 0 set (and meeting various other conditions).

This should probably be implemented as a command which can be cron'd to run on an interval.

It should take into account things like:

• Whether a score is pinned
• Whether a score is part of a multiplayer game which should cause it to remain
• Whether the score is still the most relevant high score (and potentially change the preserve flag if not).
• Probably more things

### Tasks
- [ ] https://github.com/ppy/osu-queue-score-statistics/pull/144
- [ ] https://github.com/ppy/osu-queue-score-statistics/pull/145
- [ ] https://github.com/ppy/osu-queue-score-statistics/pull/243
- [ ] https://github.com/ppy/osu-queue-score-statistics/pull/244
- [ ] https://github.com/ppy/osu-web/pull/11118
- [ ] https://github.com/ppy/osu-queue-score-statistics/pull/254
- [ ] Add queue to signal that a score may not need to be preserved anymore

[peppy]

As a note here, depending on ppy/osu-infrastructure#16 conclusion this command will need to be altered.

Put another way, we need to make sure that partition rotation doesn't happen to soon, to ensure that things like replay cleanup can be performed first.

[peppy]

Short term, this won't be running. We'll keep all scores around until it's ready to go.