refactor: move test utils to package (#3206)

tests/kit/utils/editor.ts

@@ -0,0 +1,12 @@
+import type { Page } from '@playwright/test';
+import { expect } from '@playwright/test';
+
+export async function checkBlockHub(page: Page) {
+  const box = await page.locator('affine-block-hub').boundingBox();
+  if (!box) throw new Error('block-hub not found');
+  await page.getByTestId('block-hub').click();
+  await page.waitForTimeout(500);
+  const box2 = await page.locator('affine-block-hub').boundingBox();
+  if (!box2) throw new Error('block-hub not found');
+  expect(box2.height).toBeGreaterThan(box.height);
+}