HIVE-2199: Improve isControlledByMachinePool robustness

[huangmingxia]

Require HiveManagedLabel for prefix-based matching to prevent false positives where MachineSets match the naming prefix but aren't actually managed by Hive. This ensures only MachineSets under Hive management are identified as controlled, preventing unexpected deletion of externally managed resources.

[openshift-ci-robot]

@huangmingxia: This pull request references HIVE-2199 which is a valid jira issue.

Details

In response to this:

Require HiveManagedLabel for prefix-based matching to prevent false positives where MachineSets match the naming prefix but aren't actually managed by Hive. This ensures only MachineSets under Hive management are identified as controlled, preventing unexpected deletion of externally managed resources.

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[openshift-ci]

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[openshift-ci]

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This pull-request has been approved by: huangmingxia
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[huangmingxia]

/hold

[openshift-ci]

@huangmingxia: all tests passed!

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 50.40%. Comparing base (b061ef0) to head (521ff84).
⚠️ Report is 2 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #2822   +/-   ##
=======================================
  Coverage   50.39%   50.40%           
=======================================
  Files         279      279           
  Lines       34190    34193    +3     
=======================================
+ Hits        17231    17234    +3     
  Misses      15595    15595           
  Partials     1364     1364           

Files with missing lines	Coverage Δ
...g/controller/machinepool/machinepool_controller.go	63.53% <100.00%> (+0.12%)	⬆️

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