When deleting multiple sstables with the same prefix
the deletion atomicity is ensured by the pending_delete_log file,
so if scylla crashes in the middle, deletions will be replyed on
restart.
Therefore, we don't have to ensure atomicity of each individual
`unlink`. We just need to sync the directory once, before
removing the pending_delete_log file.
Signed-off-by: Benny Halevy <bhalevy@scylladb.com>
Closes#14967
6f037549ac