[cherry-pick] fix: Spiderpool GC incorrect IP address during statefulset Pod scale up/down, causing IP conflict

[ty-dc]

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What type of PR is this?

What this PR does / why we need it:

Which issue(s) this PR fixes:

Fixes #3901

Special notes for your reviewer:

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 81.60%. Comparing base (722b411) to head (4eecd38).
Report is 2 commits behind head on release-v0.9.

Additional details and impacted files

@@               Coverage Diff                @@
##           release-v0.9    #3912      +/-   ##
================================================
+ Coverage         81.53%   81.60%   +0.07%     
================================================
  Files                50       50              
  Lines              4338     4355      +17     
================================================
+ Hits               3537     3554      +17     
  Misses              640      640              
  Partials            161      161              

Flag	Coverage Δ
unittests	81.60% <100.00%> (+0.07%)	⬆️

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Files	Coverage Δ
...orkloadendpointmanager/workloadendpoint_manager.go	100.00% <100.00%> (ø)