stream scan includes other scans

Author: kwannoel

src/meta/src/stream/stream_graph/fragment.rs

@@ -704,8 +704,6 @@ impl StreamFragmentGraph {
             let fragment_id = fragment_id.as_global_id();
             let fragment_mask = fragment.fragment_type_mask;
             let candidates = [
-                FragmentTypeFlag::CrossDbSnapshotBackfillStreamScan,
-                FragmentTypeFlag::SnapshotBackfillStreamScan,
                 FragmentTypeFlag::StreamScan,
                 FragmentTypeFlag::SourceScan,
             ];