Feat: Delete the agent and tool nodes downstream of the agent node #3221 (#8450)

### What problem does this PR solve?

Feat: Delete the agent and tool nodes downstream of the agent node #3221

### Type of change


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

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

@@ -54,13 +54,13 @@ function InnerAgentNode({
           type="target"
           position={Position.Top}
           isConnectable={false}
-          id="f"
+          id={NodeHandleId.AgentTop}
         ></Handle>
         <Handle
           type="source"
           position={Position.Bottom}
           isConnectable={false}
-          id="e"
+          id={NodeHandleId.AgentBottom}
           style={{ left: 180 }}
         ></Handle>
         <Handle