test: fix flaky common WPT inspector test

[inoway46]

test/parallel/test-common-wpt-inspect.js occasionally times out while waiting for Debugger.paused in the macOS CI job.

The inspector connection can be established before the WPT child reaches its startup wait. In that case, Runtime.runIfWaitingForDebugger can be sent too early, leaving the child blocked in the startup wait.

Wait for NodeRuntime.waitingForDebugger before resuming the target, consistent with other inspector tests (https://github.com/nodejs/node/blob/main/test/parallel/test-esm-loader-hooks-inspect-brk.js#L17-L25).

Failed CI runs

• https://github.com/nodejs/node/actions/runs/34269544759
• https://github.com/nodejs/node/actions/runs/34163539079

[nodejs-github-bot]

CI: https://ci.nodejs.org/job/node-test-pull-request/77245/

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 90.17%. Comparing base (b3fb344) to head (f411c2c).
⚠️ Report is 3 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #65937      +/-   ##
==========================================
+ Coverage   90.16%   90.17%   +0.01%     
==========================================
  Files         771      771              
  Lines      265434   265434              
  Branches    50450    50460      +10     
==========================================
+ Hits       239332   239365      +33     
+ Misses      17045    17011      -34     
- Partials     9057     9058       +1     

see 31 files with indirect coverage changes

🚀 New features to boost your workflow:

• ❄️ Test Analytics: Detect flaky tests, report on failures, and find test suite problems.
• 📦 JS Bundle Analysis: Save yourself from yourself by tracking and limiting bundle sizes in JS merges.