After 146e49d0dd (Rewrap keyspace population loop) the datadir layout is no longer needed by sstables boot-time loader and finally directories can be omitted for S3-backed keyspaces. Tables of that keyspace don't touch/remove their datadirs either (snapshots still don't work for S3)
fixes: #13020Closesscylladb/scylladb#16007
* github.com:scylladb/scylladb:
test/object_store: Check that keyspace directory doesn't appear
sstables/storage: Do storage init/destroy based on storage options
replica/{ks|cf}: Move storage init/destroy to sstables manager
database: Add get_sstables_manager(bool_class is_system) method
d8bf8f0f43