fix bugs for creating isolation region multiple times

[waynepeking348]

What type of PR is this?

bug fixes

What this PR does / why we need it:

fix bugs for isolation region be created multiple times

[codecov]

Codecov Report

Attention: 12 lines in your changes are missing coverage. Please review.

Comparison is base (8d61a49) 53.43% compared to head (0e0e9df) 53.41%.
Report is 1 commits behind head on main.

Files	Patch %	Lines
...sor/plugin/qosaware/resource/cpu/advisor_helper.go	67.85%	6 Missing and 3 partials ⚠️
...assembler/headroomassembler/assembler_dedicated.go	50.00%	1 Missing and 1 partial ⚠️
...sadvisor/plugin/qosaware/resource/helper/helper.go	66.66%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #363      +/-   ##
==========================================
- Coverage   53.43%   53.41%   -0.03%     
==========================================
  Files         437      437              
  Lines       48155    48150       -5     
==========================================
- Hits        25732    25717      -15     
- Misses      19505    19527      +22     
+ Partials     2918     2906      -12     

Flag	Coverage Δ
unittest	53.41% <70.00%> (-0.03%)	⬇️

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