When a sstable set is cloned, we don't want a change in cloned set
propagating to the former one.
It happens today with partitioned_sstable_set::_all_runs, because
sets are sharing ownership of runs, which is wrong.
Let's not violate clone semantics by copying all_runs when cloning.
Doesn't affect data correctness as readers work directly with
sstables, which are properly cloned. Can result in a crash in ICS
when it is estimating pending tasks, but should be very rare in
practice.
Fixes#17878.
Signed-off-by: Raphael S. Carvalho <raphaelsc@scylladb.com>
Closesscylladb/scylladb#17879
d5a5005afa