test: convert test-messageevent-brandcheck forEach to for...of loop

[nachiketap11]

Updated the forEach loop in test-messageevent-brandcheck.js to a for...of loop for a cleaner stack trace.

[nachiketap11]

@jasnell, tagging you for review.

[Ethan-Arrowood]

Great work!

[nodejs-github-bot]

CI: https://ci.nodejs.org/job/node-test-pull-request/75861/

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 90.32%. Comparing base (1662b69) to head (d335b90).
⚠️ Report is 29 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #65279      +/-   ##
==========================================
+ Coverage   90.31%   90.32%   +0.01%     
==========================================
  Files         751      751              
  Lines      249776   250000     +224     
  Branches    47173    47238      +65     
==========================================
+ Hits       225587   225821     +234     
+ Misses      15585    15565      -20     
- Partials     8604     8614      +10     

see 44 files with indirect coverage changes

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