fix(kcmas): missing store instance in same node

[zzzzhhb]

What type of PR is this?

Bug fixes

What this PR does / why we need it:

Which issue(s) this PR fixes:

When more than one store instances are scheduled on same node, only one instance can be used.

Special notes for your reviewer:

[codecov]

Codecov Report

Attention: 4 lines in your changes are missing coverage. Please review.

Comparison is base (1d2526f) 53.43% compared to head (e8ac22c) 53.24%.

Files	Patch %	Lines
...g/util/service-discovery/service_single_port_sd.go	60.00%	1 Missing and 3 partials ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #392      +/-   ##
==========================================
- Coverage   53.43%   53.24%   -0.19%     
==========================================
  Files         439      439              
  Lines       48419    48424       +5     
==========================================
- Hits        25874    25785      -89     
- Misses      19608    19706      +98     
+ Partials     2937     2933       -4     

Flag	Coverage Δ
unittest	53.24% <60.00%> (-0.19%)	⬇️

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