test(core): split and enhance copilot e2e tests (#11007)

### TL;DR

Split and enhance copilot e2e tests.

### What Changed

#### Tests Structure

The e2e tests are organized into the following categories:

1. **Basic Tests (`/basic`)**: Tests for verifying core AI capabilities including feature onboarding, authorization workflows, and basic chat interactions.
2. **Chat Interaction Tests (`/chat-with`)**: Tests for verifying the AI's interaction with various ​object types, such as attachments, images, text content, Edgeless elements, etc.
3. **AI Action Tests (`/ai-action`)**: Tests for verifying the AI's actions, such as text translation, gramma correction, etc.
4. **Insertion Tests (`/insertion`)**: Tests for verifying answer insertion functionality.

#### Tests Writing

Writing a copilot test cases is easier and clear

e.g.
```ts
test('support chat with specified doc', async ({ page, utils }) => {
  // Initialize the doc
  await focusDocTitle(page);
  await page.keyboard.insertText('Test Doc');
  await page.keyboard.press('Enter');
  await page.keyboard.insertText('EEee is a cute cat');

  await utils.chatPanel.chatWithDoc(page, 'Test Doc');

  await utils.chatPanel.makeChat(page, 'What is EEee?');
  await utils.chatPanel.waitForHistory(page, [
    {
      role: 'user',
      content: 'What is EEee?',
    },
    {
      role: 'assistant',
      status: 'success',
    },
  ]);

  const { content } = await utils.chatPanel.getLatestAssistantMessage(page);
  expect(content).toMatch(/EEee/);
});
```

#### Summary

||Cases|
|------|----|
|Before|19||
|After|151||

> Close BS-2769

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

@@ -0,0 +1,27 @@
+// eslint-disable no-empty-pattern
+import { test as base } from '@affine-test/kit/playwright';
+
+import { ChatPanelUtils } from '../utils/chat-panel-utils';
+import { EditorUtils } from '../utils/editor-utils';
+import { TestUtils } from '../utils/test-utils';
+
+interface TestUtilsFixtures {
+  utils: {
+    testUtils: TestUtils;
+    chatPanel: typeof ChatPanelUtils;
+    editor: typeof EditorUtils;
+  };
+}
+
+export const test = base.extend<TestUtilsFixtures>({
+  utils: async ({}, use) => {
+    const testUtils = TestUtils.getInstance();
+    await use({
+      testUtils,
+      chatPanel: ChatPanelUtils,
+      editor: EditorUtils,
+    });
+  },
+});
+
+export type TestFixtures = typeof test;