streaming: Improve state transition log for maybe_completed and complete
streaming: Improve state transition log for maybe_completed and complete

kjniemi/scylla,duarten/scylla,kjniemi/scylla,avikivity/scylla,duarten/scylla,duarten/scylla,raphaelsc/scylla,avikivity/scylla,avikivity/scylla,kjniemi/scylla,scylladb/scylla,raphaelsc/scylla,scylladb/scylla,scylladb/scylla,scylladb/scylla,raphaelsc/scylla