Bugfix KafkaMirrorMaker2AssemblyOperatorPodSet test

[Kcruz28]

Type of change

• Bugfix

Description

This PR fixes a flaky test in KafkaMirrorMaker2AssemblyOperatorPodSetTest.java where testScaleDownCluster was failing intermittently due to non-deterministic ordering of the labelSelector string, generated from a HashMap. The flakiness was exposed using NonDex, a bytecode shuffling tool that revealed order-dependent failures. The fix updates the assertion to compare sets of labels instead of exact string matches, ensuring the test is order-independent while validating the correct labels are present. This eliminates false negatives in CI and improves test reliability without affecting production code

Checklist

Please go through this checklist and make sure all applicable tasks have been done

• Write tests
• Make sure all tests pass
• Update documentation
• Check RBAC rights for Kubernetes / OpenShift roles
• Try your changes from Pod inside your Kubernetes and OpenShift cluster, not just locally
• Reference relevant issue(s) and close them after merging
• Update CHANGELOG.md
• Supply screenshots for visual changes, such as Grafana dashboards

[scholzj]

Thanks for the PR. I do not think we ever saw this test be flaky in the CIs or locally. So I'm curious about the environment where you saw this being flaky.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 74.79%. Comparing base (77d6103) to head (908ca36).
⚠️ Report is 40 commits behind head on main.

Additional details and impacted files

@@             Coverage Diff              @@
##               main   #12203      +/-   ##
============================================
+ Coverage     74.76%   74.79%   +0.02%     
- Complexity     6616     6630      +14     
============================================
  Files           377      377              
  Lines         25329    25360      +31     
  Branches       3394     3402       +8     
============================================
+ Hits          18938    18967      +29     
- Misses         5003     5006       +3     
+ Partials       1388     1387       -1     

see 13 files with indirect coverage changes

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[scholzj]

Thanks.