tests: sstables: Add test for writing combined stream with range tombstones at same position
tests: sstables: Add test for writing combined stream with range tombstones at same position

duarten/scylla,avikivity/scylla,scylladb/scylla,scylladb/scylla,duarten/scylla,avikivity/scylla,avikivity/scylla,duarten/scylla,scylladb/scylla,scylladb/scylla