test(core): common setup for ai tests (#11644)

### TL:DR

By sharing initialization logic, accelerate test case execution.

### What Changed

* Global setup for copilot e2e
  * Login
  * Create Workspace
* Enable fully parallel for ci

### Optimization Comparison​

Comparing with PR [fix(core): ask AI input box in the whiteboard is blocked by the menu …](https://github.com/toeverything/AFFiNE/pull/11634)：

|           |    Shard 1   |2|3|4|5|6|7|8|
| ------|----|----|----|----|----|---|---|--|
|Before|15min|14min|14min|14min|14min|13min|15min|10min|
|After|8min|11min|8min|8min|8min|8min|8min|7min|

### Trade-Off

Since all copilot use cases currently share a single user and workspace, some test cases need to focus on **isolation** and **independence**.
For example, when testing Embedding-related workflows：
* Different document contents should be used to avoid interference.
* After each test case execution, **cleanup** operations are also required.
* Some tests should be configured to **serial** mode.

```ts
test.describe.configure({ mode: 'serial' });

test.describe('AIChatWith/Collections', () => {
  test.beforeEach(async ({ loggedInPage: page, utils }) => {
    await utils.testUtils.setupTestEnvironment(page);
    await utils.chatPanel.openChatPanel(page);
    await utils.editor.clearAllCollections(page);

    await utils.testUtils.createNewPage(page);
  });

  test.afterEach(async ({ loggedInPage: page, utils }) => {
    // clear all collections
    await utils.editor.clearAllCollections(page);
  });

  test('should support chat with collection', async ({
    loggedInPage: page,
    utils,
  }) => {
    // Create two collections
    await utils.editor.createCollectionAndDoc(
      page,
      'Collection 1',
      'CollectionAAaa is a cute dog'
    );

    await utils.chatPanel.chatWithCollections(page, ['Collection 1']);
    await utils.chatPanel.makeChat(page, 'What is CollectionAAaa(Use English)');
    // ...
  });

  test('should support chat with multiple collections', async ({
    loggedInPage: page,
    utils,
  }) => {
    // Create two collections
    await utils.editor.createCollectionAndDoc(
      page,
      'Collection 2',
      'CollectionEEee is a cute cat'
    );

    await utils.editor.createCollectionAndDoc(
      page,
      'Collection 3',
      'CollectionFFff is a cute dog'
    );

    await utils.chatPanel.chatWithCollections(page, [
      'Collection 2',
      'Collection 3',
    ]);
    await utils.chatPanel.makeChat(
      page,
      'What is CollectionEEee? What is CollectionFFff?(Use English)'
    );
    // ...
  });
});

```

> CLOSE AI-51

tests/affine-cloud-copilot/e2e/basic/chat.spec.ts

@@ -1,17 +1,16 @@
-import { loginUser } from '@affine-test/kit/utils/cloud';
 import { expect } from '@playwright/test';
 
 import { test } from '../base/base-test';
 
 test.describe('AIBasic/Chat', () => {
-  test.beforeEach(async ({ page, utils }) => {
-    const user = await utils.testUtils.getUser();
-    await loginUser(page, user);
+  test.beforeEach(async ({ utils, loggedInPage: page }) => {
     await utils.testUtils.setupTestEnvironment(page);
     await utils.chatPanel.openChatPanel(page);
   });
 
-  test('should display empty state when no messages', async ({ page }) => {
+  test('should display empty state when no messages', async ({
+    loggedInPage: page,
+  }) => {
     // Verify empty state UI
     await expect(page.getByTestId('chat-panel-empty-state')).toBeVisible();
     await expect(page.getByTestId('ai-onboarding')).toBeVisible();
@@ -22,7 +21,7 @@ test.describe('AIBasic/Chat', () => {
         - AI is loading
         - AI generating
         - AI success
-    `, async ({ page, utils }) => {
+    `, async ({ loggedInPage: page, utils }) => {
     // Type and send a message
     await utils.chatPanel.makeChat(page, 'Introduce AFFiNE to me');
 
@@ -66,7 +65,10 @@ test.describe('AIBasic/Chat', () => {
     ]);
   });
 
-  test('should support stop generating', async ({ page, utils }) => {
+  test('should support stop generating', async ({
+    loggedInPage: page,
+    utils,
+  }) => {
     await utils.chatPanel.makeChat(page, 'Introduce AFFiNE to me');
 
     // AI Generating
@@ -95,7 +97,7 @@ test.describe('AIBasic/Chat', () => {
   });
 
   test('should render ai actions inline if the answer is the last one in the list, otherwise, nest them under the "More" menu', async ({
-    page,
+    loggedInPage: page,
     utils,
   }) => {
     await utils.chatPanel.makeChat(page, 'Hello, how can you help me?');
@@ -140,7 +142,7 @@ test.describe('AIBasic/Chat', () => {
   });
 
   test('should show scroll indicator when there are many messages', async ({
-    page,
+    loggedInPage: page,
     utils,
   }) => {
     // Set window height to 100px to ensure scroll indicator appears
@@ -188,7 +190,10 @@ test.describe('AIBasic/Chat', () => {
     await expect(scrollDownIndicator).not.toBeVisible();
   });
 
-  test('should show error when request failed', async ({ page, utils }) => {
+  test('should show error when request failed', async ({
+    loggedInPage: page,
+    utils,
+  }) => {
     // Simulate network error by disconnecting
     await page.route('**/graphql', route => route.abort('failed'));
 
@@ -199,7 +204,10 @@ test.describe('AIBasic/Chat', () => {
     await expect(page.getByTestId('action-retry-button')).toBeVisible();
   });
 
-  test('should support retrying failed messages', async ({ page, utils }) => {
+  test('should support retrying failed messages', async ({
+    loggedInPage: page,
+    utils,
+  }) => {
     // Simulate network error by disconnecting
     await page.route('**/graphql', route => route.abort('failed'));
 
@@ -238,7 +246,10 @@ test.describe('AIBasic/Chat', () => {
     ]);
   });
 
-  test('should support retrying question', async ({ page, utils }) => {
+  test('should support retrying question', async ({
+    loggedInPage: page,
+    utils,
+  }) => {
     await utils.chatPanel.makeChat(
       page,
       'Introduce Large Language Model in under 500 words'
@@ -282,7 +293,7 @@ test.describe('AIBasic/Chat', () => {
   });
 
   test('should support sending message with button', async ({
-    page,
+    loggedInPage: page,
     utils,
   }) => {
     await utils.chatPanel.openChatPanel(page);
@@ -300,7 +311,10 @@ test.describe('AIBasic/Chat', () => {
     ]);
   });
 
-  test('should support clearing chat', async ({ page, utils }) => {
+  test('should support clearing chat', async ({
+    loggedInPage: page,
+    utils,
+  }) => {
     await utils.chatPanel.openChatPanel(page);
     await utils.chatPanel.makeChat(page, 'Hello');
     await utils.chatPanel.waitForHistory(page, [
@@ -317,7 +331,10 @@ test.describe('AIBasic/Chat', () => {
     await utils.chatPanel.waitForHistory(page, []);
   });
 
-  test('should support copying answer', async ({ page, utils }) => {
+  test('should support copying answer', async ({
+    loggedInPage: page,
+    utils,
+  }) => {
     await utils.chatPanel.openChatPanel(page);
     await utils.chatPanel.makeChat(page, 'Hello');
     await utils.chatPanel.waitForHistory(page, [