test(core): embedding settings (#11554)

### TL;DR

tests: workspace embedding e2e

> CLOSE BS-3052

<!-- This is an auto-generated comment: release notes by coderabbit.ai -->

## Summary by CodeRabbit

- **New Features**
  - Introduced comprehensive end-to-end tests for workspace embedding settings, including toggling embedding, uploading and managing attachments, pagination, and ignoring documents.
  - Added utilities for automated interaction with the settings panel and document creation in tests.

- **Tests**
  - Implemented detailed scenarios to verify workspace embedding functionality and user interactions within the settings panel.

<!-- end of auto-generated comment: release notes by coderabbit.ai -->

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

@@ -4,6 +4,7 @@ import type { Page } from '@playwright/test';
 
 import { ChatPanelUtils } from '../utils/chat-panel-utils';
 import { EditorUtils } from '../utils/editor-utils';
+import { SettingsPanelUtils } from '../utils/settings-panel-utils';
 import { TestUtils } from '../utils/test-utils';
 
 interface TestUtilsFixtures {
@@ -11,6 +12,7 @@ interface TestUtilsFixtures {
     testUtils: TestUtils;
     chatPanel: typeof ChatPanelUtils;
     editor: typeof EditorUtils;
+    settings: typeof SettingsPanelUtils;
   };
   loggedInPage: Page;
 }
@@ -22,6 +24,7 @@ export const test = base.extend<TestUtilsFixtures>({
       testUtils,
       chatPanel: ChatPanelUtils,
       editor: EditorUtils,
+      settings: SettingsPanelUtils,
     });
   },
   loggedInPage: async ({ browser }, use) => {