update GeneratePVCName method

[ZhaoQing7892]

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[codecov]

Codecov Report

❌ Patch coverage is 83.33333% with 1 line in your changes missing coverage. Please review.
✅ Project coverage is 45.78%. Comparing base (1390314) to head (352bb43).
⚠️ Report is 1 commits behind head on master.

Files with missing lines	Patch %	Lines
pkg/controller/sandbox/sandbox_controller.go	66.66%	0 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master      #72      +/-   ##
==========================================
+ Coverage   45.71%   45.78%   +0.06%     
==========================================
  Files          75       75              
  Lines        4379     4377       -2     
==========================================
+ Hits         2002     2004       +2     
+ Misses       2188     2185       -3     
+ Partials      189      188       -1     

Flag	Coverage Δ
unittests	45.78% <83.33%> (+0.06%)	⬆️

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