Feat: Add IterationNode component #3221 (#8461)

### What problem does this PR solve?

Feat: Add IterationNode component #3221
### Type of change


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

web/src/pages/agent/constant.tsx

@@ -644,7 +644,7 @@ export const initialEmailValues = {
 };
 
 export const initialIterationValues = {
-  delimiter: ',',
+  items_ref: '',
 };
 export const initialIterationStartValues = {};
 
@@ -665,6 +665,7 @@ export const initialWaitingDialogueValues = {};
 
 export const initialAgentValues = {
   ...initialLlmBaseValues,
+  description: '',
   sys_prompt: ``,
   prompts: [{ role: PromptRole.User, content: `{${AgentGlobals.SysQuery}}` }],
   message_history_window_size: 12,