feat: Fetch conversation list by @tanstack/react-query and displays error message that task_executor does not exist #2088 (#2112)

### What problem does this PR solve?

feat: Fetch conversation list by @tanstack/react-query
feat: Displays error message that task_executor does not exist

### Type of change


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

web/src/constants/chat.ts

@@ -15,3 +15,10 @@ export enum SharedFrom {
   Agent = 'agent',
   Chat = 'chat',
 }
+
+export enum ChatSearchParams {
+  DialogId = 'dialogId',
+  ConversationId = 'conversationId',
+}
+
+export const EmptyConversationId = 'empty';