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7dfb76f9a7
When a staging sstable is registered to view building worker, it needs to make a round trip from its original shard to shard 0 (in order to create a view building task) and back (to be eventually processed). Until now this was done using plain `sstables::shared_sstable` (= `lw_shared_ptr`) which is not safe to be moved between shards. This patch fixes this by wrapping the pointer in `foreign_ptr` and obtains necessary informations (owner shard, last token) on the original shard (instead of on shard0). Then all of those objects are put into freshly introduced structure `staging_sstable_task_info`, which can be safely moved between shards. Fixes scylladb/scylladb#25859