feat: add regenerate cases

Signed-off-by: SuZhou-Joe <suzhou@amazon.com>

cypress/integration/plugins/dashboards-assistant/chatbot_agent_framework_spec.js

@@ -39,6 +39,26 @@ if (Cypress.env('DASHBOARDS_ASSISTANT_ENABLED')) {
 
         // should have a suggestion section
         cy.get(`[aria-label="chat suggestions"]`).should('be.length', 1);
+
+        // Click regenerate button
+        cy.get(`button[title="regenerate message"]`).click();
+
+        // The previous message should be gone
+        cy.get(`button[title="regenerate message"]`).should('be.length', 0);
+
+        // suggestions should be gone
+        cy.get(`[aria-label="chat suggestions"]`).should('be.length', 0);
+
+        // wait for 1 second
+        cy.wait(1000);
+
+        // The regenrate message should be there
+        cy.contains(
+          'The indices in your cluster are the names listed in the response obtained from using a tool to get information about the OpenSearch indices.'
+        );
+
+        // should have a suggestion section
+        cy.get(`[aria-label="chat suggestions"]`).should('be.length', 1);
       });
     });
   });