converting_mutation_partition_applier: Expose cell upgrade logic
converting_mutation_partition_applier: Expose cell upgrade logic

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