Feat: Add a child operator node by clicking the operator node anchor point #3221 (#8309)

### What problem does this PR solve?

Feat: Add a child operator node by clicking the operator node anchor
point #3221

### Type of change


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

web/src/pages/agent/canvas/node/agent-node.tsx

@@ -36,6 +36,7 @@ function InnerAgentNode({
               position={Position.Left}
               isConnectable={isConnectable}
               style={LeftHandleStyle}
+              nodeId={id}
             ></CommonHandle>
             <CommonHandle
               type="source"
@@ -44,6 +45,7 @@ function InnerAgentNode({
               className={styles.handle}
               id="b"
               style={RightHandleStyle}
+              nodeId={id}
             ></CommonHandle>
           </>
         )}