add pages api route e2e test

Author: HyperKiko

examples/e2e/pages-router/e2e/api.test.ts

@@ -0,0 +1,8 @@
+import { expect, test } from "@playwright/test";
+
+test("should not fail on an api route", async ({ page }) => {
+  const result = await page.goto("/api/hello");
+  expect(result?.status()).toBe(200);
+  const body = await result?.json();
+  expect(body).toEqual({ hello: "world" });
+});