chore(infra): add url test to playwright (#11795)

<!-- This is an auto-generated comment: release notes by coderabbit.ai -->
## Summary by CodeRabbit

- **Chores**
  - Updated Playwright test configurations to use full URL strings instead of port numbers for web server identification.
  - Unified server startup approach in test environments by integrating web server configuration directly into Playwright, replacing custom setup scripts.
  - Removed obsolete development server setup files to streamline test initialization.
<!-- end of auto-generated comment: release notes by coderabbit.ai -->

tests/affine-mobile/playwright.config.ts

@@ -50,12 +50,12 @@ const config: PlaywrightTestConfig = {
     // Intentionally not building the web, reminds you to run it by yourself.
     {
       command: 'yarn run -T affine dev -p @affine/mobile',
-      port: 8080,
       timeout: 120 * 1000,
       reuseExistingServer: !process.env.CI,
       env: {
         COVERAGE: process.env.COVERAGE || 'false',
       },
+      url: 'http://localhost:8080',
     },
   ],
 };