fix: actual number of replicas in sharding rollout status

[leon-inf]

close #9922

[leon-inf]

/nopick

[apecloud-bot]

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[codecov]

Codecov Report

❌ Patch coverage is 50.00000% with 3 lines in your changes missing coverage. Please review.
✅ Project coverage is 51.28%. Comparing base (1cd2f9c) to head (cc2543f).
⚠️ Report is 6 commits behind head on main.

Files with missing lines	Patch %	Lines
...ollers/apps/rollout/transformer_rollout_replace.go	40.00%	1 Missing and 2 partials ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #9937      +/-   ##
==========================================
+ Coverage   51.06%   51.28%   +0.21%     
==========================================
  Files         541      541              
  Lines       58340    58507     +167     
==========================================
+ Hits        29793    30006     +213     
+ Misses      25611    25565      -46     
  Partials     2936     2936              

Flag	Coverage Δ
unittests	51.28% <50.00%> (+0.21%)	⬆️

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[leon-inf]

/approve