zfs: merge openzfs/zfs@8a7407012

Notable upstream pull request merges:
#15368 008baa091 FreeBSD: Reduce divergence from in-tree sources
#15371 1b310dfb1 DMU: Do not pre-read holes during write
#15395 8a7407012 Zpool can start allocating from metaslab before
TRIMs have completed

Obtained from: OpenZFS
OpenZFS commit: 8a740701283495e59944839bb2607f80907d950e