When collected sstables are deleted each is passed into
sstables_manager.delete_atomically(). For on-disk sstables this creates
a deletion log for each removed stable, which is quite an overkill. The
atomic deletion callback already accepts vector of shared sstables, so
it's simpler (and a bit faster) to remove them all in a batch
Signed-off-by: Pavel Emelyanov <xemul@scylladb.com>
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