fix: Fix GetReplicas API return nil status (#33715)

[weiliu1031]

issue: #33702
pr: #33715

[codecov]

Codecov Report

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

Project coverage is 82.27%. Comparing base (a7ae45c) to head (7dc959a).
Report is 6 commits behind head on 2.4.

Additional details and impacted files

@@            Coverage Diff             @@
##              2.4   #34019      +/-   ##
==========================================
+ Coverage   82.25%   82.27%   +0.01%     
==========================================
  Files        1015     1015              
  Lines      129458   129458              
==========================================
+ Hits       106483   106506      +23     
+ Misses      18974    18947      -27     
- Partials     4001     4005       +4     

Files	Coverage Δ
internal/querycoordv2/services.go	86.81% <0.00%> (+0.24%)	⬆️

... and 37 files with indirect coverage changes

[chyezh]

/lgtm

[congqixia]

/lgtm

[sre-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: congqixia, weiliu1031

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