feat(editor): edgeless page block toolbar (#9707)

Close [BS-2315](https://linear.app/affine-design/issue/BS-2315/page-block-header)

### What Changes
- Add header toolbar to page block (the first note in canvas)
- Add e2e tests
- Add some edgeless e2e test utils.  **The package `@blocksuite/affine` was added to `"@affine-test/kit"`**

tests/kit/src/utils/image.ts

@@ -5,7 +5,6 @@ export async function importImage(page: Page, pathInFixtures: string) {
   await page.evaluate(() => {
     // Force fallback to input[type=file] in tests
     // See https://github.com/microsoft/playwright/issues/8850
-    // @ts-expect-error allow
     window.showOpenFilePicker = undefined;
   });