bcachefs updates for 6.13 v2

- Self healing work:
  Allocator and reflink now run the exact same check/repair code that
  fsck does at runtime, where applicable.

  The long term goal here is to remove inconsistent() errors (that cause
  us to go emergency read only) by lifting fsck code up to normal
  runtime paths; we should only go emergency read-only if we detect an
  inconsistency that was due to a runtime bug - or truly catastrophic
  damage (corrupted btree roots/interior nodes).

- Reflink repair no longer deletes reflink pointers: instead we flip an
  error bit and log the error, and they can still be deleted by file
  deletion. This means a temporary failure to find an indirect extent
  (perhaps repaired later by btree node scan) won't result in
  unnecessary data loss

- Improvements to rebalance data path option handling: we can now
  correctly apply changed filesystem-level io path options to pending
  rebalance work, and soon we'll be able to apply file-level io path
  option changes to indirect extents.

Additions from last pull request:

- Fixes for compression inconsistencies with superblock feature bits,
  found by sizbot

- Fix some O(n^2) issues in journal replay

- Fix the evacuate_bucket tracepoint
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