Fix: StatefulSet get failed in validateWorkloadSpreadSpec

[Slideee]

Ⅰ. Describe what this PR does

Fix StatefulSet get failed in validateWorkloadSpreadSpec

Ⅱ. Does this pull request fix one issue?

#1964 #1713

Ⅲ. Describe how to verify it

Ⅳ. Special notes for reviews

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 1 line in your changes missing coverage. Please review.

Project coverage is 42.72%. Comparing base (7c53444) to head (98b2134).
Report is 6 commits behind head on master.

Files with missing lines	Patch %	Lines
...loadspread/validating/workloadspread_validation.go	0.00%	0 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1965      +/-   ##
==========================================
- Coverage   42.75%   42.72%   -0.04%     
==========================================
  Files         314      314              
  Lines       31367    31367              
==========================================
- Hits        13412    13402      -10     
- Misses      16585    16596      +11     
+ Partials     1370     1369       -1     

Flag	Coverage Δ
unittests	42.72% <0.00%> (-0.04%)	⬇️

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[furykerry]

/lgtm
/approve

[kruise-bot]

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