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6cb263bab0
When handling `repair_stream_cmd::end_of_current_rows`, passing the foreign list directly to `put_row_diff_handler` triggered a massive synchronous deep copy on the destination shard. Additionally, destroying the list triggered a synchronous deallocation on the source shard. This blocked the reactor and triggered the CPU stall detector. This commit fixes the issue by introducing `clone_gently()` to copy the list elements one by one, and leveraging the existing `utils::clear_gently()` to destroy them. Both utilize `seastar::coroutine::maybe_yield()` to allow the reactor to breathe during large cross-shard transfers and cleanups. Fixes SCYLLADB-403 Closes scylladb/scylladb#28979