feat(core): enable new all docs by default (#12404)

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

- **Refactor**
  - Simplified the user interface by always displaying the new All Pages view, removing the feature flag and old page version.
  - Updated selection interactions to use shift+click on document items instead of checkboxes.
  - Centralized drag-and-drop functionality in document list items and simplified drag handle behavior.
  - Generalized new page button component to accept standard HTML attributes.
  - Changed test ID attributes on new page buttons and list headers to use standard `data-testid`.

- **Bug Fixes**
  - Added stable test identifiers to new page buttons, document list items, menu items, and operation buttons for improved test reliability.
  - Enabled external drag-and-drop support on the trash button.

- **Tests**
  - Streamlined and updated end-to-end tests to match the new selection flow and UI changes, removing outdated or redundant test cases.
  - Simplified utility functions and wait conditions in test helpers for better accuracy and maintainability.
  - Updated selectors in tests to reflect new document item identifiers and centralized page element retrieval using utility functions.
<!-- end of auto-generated comment: release notes by coderabbit.ai -->

tests/affine-cloud/e2e/storage.spec.ts

@@ -5,6 +5,7 @@ import {
   enableCloudWorkspace,
   loginUser,
 } from '@affine-test/kit/utils/cloud';
+import { getPageByTitle } from '@affine-test/kit/utils/page-logic';
 import { clickSideBarAllPageButton } from '@affine-test/kit/utils/sidebar';
 import { expect } from '@playwright/test';
 
@@ -32,14 +33,10 @@ test('should show blob management dialog', async ({ page }) => {
   await clickSideBarAllPageButton(page);
 
   // delete the welcome page ('Getting Started')
-  await page
-    .getByTestId('page-list-item')
-    .filter({
-      has: page.getByText('Getting Started'),
-    })
-    .getByTestId('page-list-operation-button')
+  await getPageByTitle(page, 'Getting Started')
+    .getByTestId('doc-list-operation-button')
     .click();
-  const deleteBtn = page.getByTestId('move-to-trash');
+  const deleteBtn = page.getByTestId('doc-list-operation-trash');
   await deleteBtn.click();
   await expect(page.getByText('Delete doc?')).toBeVisible();
   await page.getByRole('button', { name: 'Delete' }).click();