bcachefs fixes for 6.12-rc2

A lot of little fixes, bigger ones include:

- bcachefs's __wait_on_freeing_inode() was broken in rc1 due to vfs
  changes, now fixed along with another lost wakeup
- fragmentation LRU fixes; fsck now repairs successfully (this is the
  data structure copygc uses); along with some nice simplification.
- Rework logged op error handling, so that if logged op replay errors
  (due to another filesystem error) we delete the logged op instead of
  going into an infinite loop)
- Various small filesystem connectivitity repair fixes

The final part of this patch series, fixing snapshots + unlinked file
handling, is now out on the list - I'm giving that part of the series
more time for user testing.
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