test_runner: dont buffer unordered events in process isolation mode

[MoLow]

No description provided.

[nodejs-github-bot]

Review requested:

• @nodejs/test_runner

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 90.06%. Comparing base (0e8fb91) to head (645894d).
⚠️ Report is 4 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #63432      +/-   ##
==========================================
- Coverage   90.06%   90.06%   -0.01%     
==========================================
  Files         714      714              
  Lines      225918   225927       +9     
  Branches    42735    42737       +2     
==========================================
+ Hits       203471   203479       +8     
+ Misses      14232    14227       -5     
- Partials     8215     8221       +6     

Files with missing lines	Coverage Δ
lib/internal/test_runner/runner.js	94.38% <100.00%> (+0.76%)	⬆️

... and 25 files with indirect coverage changes

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[nodejs-github-bot]

CI: https://ci.nodejs.org/job/node-test-pull-request/73558/

[nodejs-github-bot]

CI: https://ci.nodejs.org/job/node-test-pull-request/73563/

[nodejs-github-bot]

CI: https://ci.nodejs.org/job/node-test-pull-request/73571/

[nodejs-github-bot]

CI: https://ci.nodejs.org/job/node-test-pull-request/73577/

[nodejs-github-bot]

CI: https://ci.nodejs.org/job/node-test-pull-request/73579/