test: aix: mark test-emit-on-destroyed as flaky

[sxa]

Re-enable the exclusion of this test which was re-enabled in #51995 after previously being excluded in #50262 as I /have/ been able to reproduce the failures in the CI 79/1000 times with the stress job this week.

Ref: #50245

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 88.51%. Comparing base (903f647) to head (4679f52).
⚠️ Report is 5 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #61381      +/-   ##
==========================================
- Coverage   88.54%   88.51%   -0.03%     
==========================================
  Files         704      704              
  Lines      208793   208793              
  Branches    40307    40309       +2     
==========================================
- Hits       184866   184807      -59     
- Misses      15913    15965      +52     
- Partials     8014     8021       +7     

see 26 files with indirect coverage changes

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