feat(server): use faster model in ci test (#13038)

fix AI-329

tests/affine-cloud-copilot/e2e/utils/test-utils.ts

@@ -1,5 +1,8 @@
 import { skipOnboarding } from '@affine-test/kit/playwright';
-import { createRandomAIUser } from '@affine-test/kit/utils/cloud';
+import {
+  createRandomAIUser,
+  switchDefaultChatModel,
+} from '@affine-test/kit/utils/cloud';
 import { openHomePage, setCoreUrl } from '@affine-test/kit/utils/load-page';
 import {
   clickNewPageButton,
@@ -58,7 +61,12 @@ export class TestUtils {
     await waitForEditorLoad(page);
   }
 
-  public async setupTestEnvironment(page: Page) {
+  public async setupTestEnvironment(
+    page: Page,
+    defaultModel = 'gemini-2.5-flash'
+  ) {
+    await switchDefaultChatModel(defaultModel);
+
     await skipOnboarding(page.context());
     await openHomePage(page);
     await this.createNewPage(page);