bcachefs changes for 6.17-rc1

No noteworthy feature work: we're in hard freeze.

Lots of bugfixes. Assorted user visible changes and fixes:

- Fix a major performance bug when deleting many files: this was caused
  by the key cache caching keys that had been deleted, causing certain
  lookups in the inode triggers to scan excessively.

- The "io_read_nopromote" counter has been broken out into sub-counters;
  these can be seen with 'bcachefs fs top' on a recent bcachefs-tools.
  This helps when diagnosing why reads aren't coming from the cache.

- Congestion tracking is now a bit less aggressive (this controls when
  we decide to do a promote); this area still needs more work.

- Metadata writes are no longer throttled by writeback throttling

- Nocow writes can now be rebalanced (e.g. background_target,
  background_compression options)

- (Almost) all recovery passes now have progress indicators.

- Repair improvements: we'll now reconstruct missing inodes if we find
  contents for that inode (more than one or two keys), not just if the
  inodes btree was damaged: similarly for 'dirent to missing inode'.

- Btree node tracepoint improvements: they've been converted to more
  modern printbuf tracepoints, and include significantly more info.

- Fix in-memory accounting going out of sync with the accounting btree
  when doing accounting updates before going RW.

- BCH_MIN_NR_BUCKETS (minimum number of buckets per device) has been
  increased from 64 to 512. In the unlikely event that anyone anyone
  actually was using bcachefs on sub 128M filesystems and doesn't want
  to lose access (modern tools will format these small filesystems with
  a more appropriate bucket size), please file a report or contact me.

  (This was just a syzbot issue, so far as I know).

- CLASS()/guard() conversion: a great deal of code has been converted to
  the new __cleanup based resource handling, and away from 'goto err'
  cleanup.
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