Fix: fail to create statefulSet applications in multi-NIC scenarios.

[ty-dc]

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• unite test or E2E test
• do not forget essential code comment and log
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What issue(s) does this PR fix:

Fixes #4388

Special notes for your reviewer:

[codecov]

Codecov Report

Attention: Patch coverage is 57.14286% with 9 lines in your changes missing coverage. Please review.

Project coverage is 79.36%. Comparing base (6e383aa) to head (93aff81).
Report is 2 commits behind head on release-v1.0.

Files with missing lines	Patch %	Lines
...orkloadendpointmanager/workloadendpoint_manager.go	55.00%	8 Missing and 1 partial ⚠️

Additional details and impacted files

@@               Coverage Diff                @@
##           release-v1.0    #4389      +/-   ##
================================================
- Coverage         79.50%   79.36%   -0.14%     
================================================
  Files                51       51              
  Lines              5783     5802      +19     
================================================
+ Hits               4598     4605       +7     
- Misses             1022     1032      +10     
- Partials            163      165       +2     

Flag	Coverage Δ
unittests	79.36% <57.14%> (-0.14%)	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

Files with missing lines	Coverage Δ
pkg/ippoolmanager/ippool_manager.go	84.61% <100.00%> (ø)
...orkloadendpointmanager/workloadendpoint_manager.go	95.40% <55.00%> (-4.60%)	⬇️

... and 1 file with indirect coverage changes