fix(ui-mode): prevent OOM crash when DEBUG logging enabled

[agg23]

When UI mode is launched with enough debug logging enabled (such as DEBUG=*), Playwright would end up crashing with an OOM error after a few seconds. This has been reported several times recently (#35706, #33086, #35152, and likely more).

This change prevents any debug logging generated in the runner process from being redirected for further processing (such as sending to the UI). This does not block all debug logging from getting to the UI; logs created in workers and possibly other processes are no longer "labeled" once reaching this redirection code, and thus are still sent along. This appears to be sufficient to solve the crash. These untouched debug logs appear in the global UI mode console.

[github-actions]

Test results for "tests 1"

1 failed
❌ [firefox-page] › page/page-evaluate.spec.ts:424:3 › should throw for too deep reference chain @firefox-ubuntu-22.04-node18

5 flaky

⚠️ [firefox-library] › library/inspector/cli-codegen-1.spec.ts:986:7 › cli codegen › should not throw csp directive violation errors @firefox-ubuntu-22.04-node18
⚠️ [chromium-library] › library/inspector/cli-codegen-pick-locator.spec.ts:35:7 › should update locator highlight @ubuntu-22.04-chromium-tip-of-tree
⚠️ [webkit-library] › library/browsercontext-viewport-mobile.spec.ts:206:5 › mobile viewport › view scale should reset after navigation @webkit-ubuntu-22.04-node18
⚠️ [webkit-library] › library/ignorehttpserrors.spec.ts:30:3 › should isolate contexts @webkit-ubuntu-22.04-node18
⚠️ [playwright-test] › ui-mode-test-watch.spec.ts:145:5 › should watch all @windows-latest-node18-1

39118 passed, 803 skipped
✔️✔️✔️

Merge workflow run.