[REGRESSION]: webServer stdout always printed

[svetlalev]

Context:

• GOOD Playwright Version: 1.36.1
• BAD Playwright Version: 1.37.0
• Operating System: Mac

Code Snippet

Help us help you! Put down a short code snippet that illustrates your bug and
that we can run and debug locally. For example:

webServer: {
    command: 'my server setup command',
    url: 'http://127.0.0.1:3001',
    reuseExistingServer: !process.env.CI,
    timeout: 60000
  }

Describe the bug

I tried updating to 1.37, but with this version if I use webServer in defineConfig it started printing all stdouts for the server.
I tried setting stdout to 'ignore' (even though this should be the default value), but the result is the same. Also tried setting stderr to 'ignore' - same thing.

[mxschmitt]

Thank you for filing the bug report. Caused by #24619.

[mxschmitt]

Fixed by #26503.