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  - Streamlined and updated end-to-end tests to match the new selection flow and UI changes, removing outdated or redundant test cases.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-local/e2e/local-first-openpage-newtab.spec.ts

@@ -3,6 +3,7 @@ import { openHomePage } from '@affine-test/kit/utils/load-page';
 import {
   clickNewPageButton,
   getBlockSuiteEditorTitle,
+  getPageByTitle,
   getPageOperationButton,
   waitForEditorLoad,
 } from '@affine-test/kit/utils/page-logic';
@@ -42,7 +43,7 @@ test('switch between new page and all page', async ({ page }) => {
   await clickNewPageButton(page, title);
   await page.getByTestId('all-pages').click();
 
-  const cell = page.getByTestId('page-list-item').getByText(title);
+  const cell = await getPageByTitle(page, title);
   await expect(cell).toBeVisible();
 
   await cell.click();