test_runner: fix suite diagnostic chanel end

[MoLow]

No description provided.

[nodejs-github-bot]

Review requested:

• @nodejs/test_runner

[nodejs-github-bot]

CI: https://ci.nodejs.org/job/node-test-pull-request/73658/

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 90.32%. Comparing base (df09b2a) to head (467092d).
⚠️ Report is 5 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main   #63533   +/-   ##
=======================================
  Coverage   90.32%   90.32%           
=======================================
  Files         730      730           
  Lines      234152   234160    +8     
  Branches    43900    43904    +4     
=======================================
+ Hits       211499   211507    +8     
- Misses      14374    14379    +5     
+ Partials     8279     8274    -5     

Files with missing lines	Coverage Δ
lib/internal/test_runner/test.js	97.90% <100.00%> (+<0.01%)	⬆️

... and 32 files with indirect coverage changes

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[nodejs-github-bot]

CI: https://ci.nodejs.org/job/node-test-pull-request/73673/