Feat: Filter the query variable drop-down box options by type #3221 (#8485)

### What problem does this PR solve?

Feat: Filter the query variable drop-down box options by type #3221

### Type of change


- [x] New Feature (non-breaking change which adds functionality)

web/src/pages/agent/constant.tsx

@@ -3058,3 +3058,8 @@ export enum NodeHandleId {
   AgentTop = 'agentTop',
   AgentBottom = 'agentBottom',
 }
+
+export enum VariableType {
+  String = 'string',
+  Array = 'array',
+}