Refactor: refactor dataflow_service.go and guard nats message re-delivery (#16826)

### Summary

1. refactor dataflow_service.go 
2. guard nats message re-delivery
3. support document parse cancelling & re-run

internal/engine/infinity/client.go

@@ -191,6 +191,11 @@ func (e *infinityEngine) GetType() string {
 	return "infinity"
 }
 
+// SupportsPageRank returns false because Infinity does not support pagerank.
+func (e *infinityEngine) SupportsPageRank() bool {
+	return false
+}
+
 // Ping checks if Infinity is accessible
 func (e *infinityEngine) Ping(ctx context.Context) error {
 	if e.client == nil || e.client.conn == nil {