LU-16298 ldiskfs: Periodically write ldiskfs superblock

LU-16298 ldiskfs: Periodically write ldiskfs superblock

This patch introduces a mechanism to periodically check and update
the superblock within the ext4 file system. The main purpose of this
patch is to keep the disk superblock up to date. The update will be
performed if more than one hour has passed since the last update,
and if more than 16MB of data have been written to disk.

This check and update is performed within the
ext4_journal_commit_callback function, ensuring that the superblock
is written while the disk is active, rather than based on a timer
that may trigger during disk idle periods.

Lustre-change: https://review.whamcloud.com/51340
Lustre-commit: e27a7b33d6351ff8b8bae101079af88f4eedac99

Signed-off-by: Vitaliy Kuznetsov <vkuznetsov@ddn.com>
Change-Id: I06eb9624b663a6ca6b15c6af2373b82f1bb63de6
Reviewed-on: https://review.whamcloud.com/c/ex/lustre-release/+/51717
Tested-by: jenkins <devops@whamcloud.com>
Tested-by: Maloo <maloo@whamcloud.com>
Reviewed-by: Alex Zhuravlev <bzzz@whamcloud.com>
Reviewed-by: Andreas Dilger <adilger@whamcloud.com>