refactor: move test utils to package (#3206)

tests/affine-local/e2e/debug-init-page.spec.ts

@@ -0,0 +1,12 @@
+import { test } from '@affine-test/kit/playwright';
+import { expect } from '@playwright/test';
+
+test('should have page0', async ({ page }) => {
+  await page.goto('http://localhost:8080/_debug/init-page.html');
+  await page.waitForSelector('v-line');
+  const pageId = await page.evaluate(async () => {
+    // @ts-expect-error
+    return globalThis.page.id;
+  });
+  expect(pageId).toBe('page0');
+});