refactor: move test utils to package (#3206)

tests/affine-local/e2e/exception-page.spec.ts

@@ -0,0 +1,8 @@
+import { test } from '@affine-test/kit/playwright';
+import { expect } from '@playwright/test';
+
+test('visit 404 page', async ({ page }) => {
+  await page.goto('http://localhost:8080/404');
+  const notFoundTip = page.locator('[data-testid=notFound]');
+  await expect(notFoundTip).toBeVisible();
+});