test: aix: mark test_threadsafe_function/test flaky on AIX

[sxa]

Ref: #61441 / #61439
Fixes a 90% failure rate on some machines.

[nodejs-github-bot]

CI: https://ci.nodejs.org/job/node-test-pull-request/70918/

[richardlau]

Fixes a 90% failure rate on some machines.

Nit, this doesn't fix it -- it just stops the CI from failing when it occurs.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 88.53%. Comparing base (91a9978) to head (3be116a).
⚠️ Report is 10 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #61452      +/-   ##
==========================================
- Coverage   88.54%   88.53%   -0.01%     
==========================================
  Files         704      704              
  Lines      208971   208971              
  Branches    40341    40342       +1     
==========================================
- Hits       185026   185009      -17     
- Misses      15919    15936      +17     
  Partials     8026     8026              

see 39 files with indirect coverage changes

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[nodejs-github-bot]

CI: https://ci.nodejs.org/job/node-test-pull-request/70934/

[sxa]

First pr-test failed on smartos22 which ran out of RAM - resuming (EDIT: Required two resumes)
GHA check on macos also failed - re-running

[nodejs-github-bot]

CI: https://ci.nodejs.org/job/node-test-pull-request/70936/