Add pr-review e2e test and speed up e2e tests (#37345)

- add pr-review e2e test
- speed up most tests by logging in via POST to avoid the login form,
login form is still exercised in a dedicated test
- speed up most tests be removing post-test cleanup, unnecessary because
each repo is created with a unique name
- misc parallelization and api call reduction
- total suite runtime is about the same as before

---------

Co-authored-by: Claude (Opus 4.7) <noreply@anthropic.com>
Co-authored-by: wxiaoguang <wxiaoguang@gmail.com>

tests/e2e/login.test.ts

@@ -1,12 +1,17 @@
+import {env} from 'node:process';
 import {test, expect} from '@playwright/test';
-import {login, logout} from './utils.ts';
+import {logout} from './utils.ts';
 
 test('homepage', async ({page}) => {
   await page.goto('/');
   await expect(page.getByRole('img', {name: 'Logo'})).toHaveAttribute('src', '/assets/img/logo.svg');
 });
 
-test('login and logout', async ({page}) => {
-  await login(page);
+test('login form and logout', async ({page}) => {
+  await page.goto('/user/login');
+  await page.getByLabel('Username or Email Address').fill(env.GITEA_TEST_E2E_USER);
+  await page.getByLabel('Password').fill(env.GITEA_TEST_E2E_PASSWORD);
+  await page.getByRole('button', {name: 'Sign In'}).click();
+  await expect(page.getByRole('link', {name: 'Sign In'})).toBeHidden();
   await logout(page);
 });