bcachefs fixes for 6.11-rc1

Assorted minor syzbot fixes, and for bigger stuff:

- Fix two disk accounting rewrite bugs
 - Disk accounting keys use the version field of bkey so that journal
   replay can tell which updates have been applied to the btree. This is
   set in the transaction commit path, after we've gotten our journal
   reservation (and our time ordering), but the
   BCH_TRANS_COMMIT_skip_accounting_apply flag that journal replay uses
   was incorrectly skipping this for new updates generated prior to
   journal replay.

   This fixes the underlying cause of an assertion pop in
   disk_accounting_read.

 - A couple fixes for disk accounting + device removal. Checking if
   acocunting replicas entries were marked in the superblock was being
   done at the wrong point, when deltas in the journal could still zero
   them out, and then additionally we'd try to add a missing replicas
   entry to the superblock without checking if it referred to an invalid
   (removed) device.

- A whole slew of repair fixes
 - fix infinite loop in propagate_key_to_snapshot_leaves(), this fixes
   an infinite loop when repairing a filesystem with many snapshots
 - fix incorrect transaction restart handling leading to occasional
   "fsck counted ..." warnings"
 - fix warning in __bch2_fsck_err() for bkey fsck errors
 - check_inode() in fsck now correctly checks if the filesystem was
   clean
 - there shouldn't be pending logged ops if the fs was clean, we now
   check for this
 - remove_backpointer() doesn't remove a dirent that doesn't actually
   point to the inode
 - many more fsck errors are AUTOFIX
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