bcachefs fixes for 6.12-rc4

- New metadata version inode_has_child_snapshots
  This fixes bugs with handling of unlinked inodes + snapshots, in
  particular when an inode is reattached after taking a snapshot;
  deleted inodes now get correctly cleaned up across snapshots.

- Disk accounting rewrite fixes
  - validation fixes for when a device has been removed
  - fix journal replay failing with "journal_reclaim_would_deadlock"

- Some more small fixes for erasure coding + device removal

- Assorted small syzbot fixes
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