zfs: merge openzfs/zfs@66b81b349

Notable upstream pull request merges:
#15290 54b1b1d89 import: require force when cachefile hostid doesn't
match on-disk
#15319 342357cd9 Reduce number of metaslab preload taskq threads
#15340 2a6c62109 ARC: Remove b_cv from struct l1arc_buf_hdr
#15347 75a2eb7fa ARC: Drop different size headers for crypto
#15350 96b9cf42e ARC: Remove b_bufcnt/b_ebufcnt from ARC headers
#15353 66b81b349 ZIL: Reduce maximum size of WR_COPIED to 7.5K
#15362 5b8688e62 zfsconcepts: add description of block cloning

Obtained from: OpenZFS
OpenZFS commit: 66b81b349749bc1ba11fa277bee860be03315429