zfs: merge openzfs/zfs@e63d026b9

Notable upstream pull request merges:
#17477 02fdd26e5 Add knob to disable slow io notifications
#17792 d0294aa75 Update dnode_next_offset_level to accept blkid in

zfs: merge openzfs/zfs@e63d026b9

Notable upstream pull request merges:
#17477 02fdd26e5 Add knob to disable slow io notifications
#17792 d0294aa75 Update dnode_next_offset_level to accept blkid instead
of offset
#17824 8c225ff1b Fix gang write late_arrival bug
#17861 -multiple Lift userspace definitions out of zfs_context.h
#17872 dcada084b Pass flags to more DMU write/hold functions
#17875 ec268cdf9 Fix caching of DDT log and BRT
#17875 ea125eeb5 BRT: Round bv_entcount up to BRT_BLOCKSIZE
#17877 6cfc3dba9 Cleanup ZIO_FLAG_IO_RETRY vs TRYHARD usage
#17885 e63d026b9 cmd/zpool cstyle issues
#17890 b4f073b5a Add BRT support to zpool prefetch command
#17903 baefe098e ZIO: Set minimum number of free issue threads to 32
#17906 6e12f0bd7 spa_misc: add an API for spa_namespace_lock
#17908 e26b9fc87 FreeBSD: Add support for _PC_CASE_INSENSITIVE
#17911 -multiple Update library ABI versions for v2.4.0
#17915 8aaed7dc4 BRT: Fix ranges to blocks conversion math
#17916 cc5cae547 BRT: Increase block size from 4KB to 8KB
#17921 72b2a9571 ZAP: Remove dmu_object_info_from_dnode() call

Obtained from: OpenZFS
OpenZFS commit: e63d026b91b822dd9b363ab9a1e39d9a66493601

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