fix:[cherry-pick]Panic if ProcessActiveStandBy returns error

[wayblink]

pr:#33369
issue:#33368

[mergify]

@wayblink Please associate the related pr of master to the body of your Pull Request. (eg. “pr: #”)

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 4 lines in your changes are missing coverage. Please review.

Project coverage is 83.09%. Comparing base (078f252) to head (59691df).
Report is 1 commits behind head on 2.3.

Additional details and impacted files

@@            Coverage Diff             @@
##              2.3   #33371      +/-   ##
==========================================
- Coverage   83.11%   83.09%   -0.02%     
==========================================
  Files         850      850              
  Lines      106716   106716              
==========================================
- Hits        88692    88671      -21     
- Misses      14716    14743      +27     
+ Partials     3308     3302       -6     

Files	Coverage Δ
internal/querycoordv2/server.go	82.66% <0.00%> (ø)
internal/rootcoord/root_coord.go	91.79% <0.00%> (ø)
internal/datacoord/server.go	71.86% <0.00%> (ø)

... and 16 files with indirect coverage changes

[xiaofan-luan]

/lgtm
/approve

[sre-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

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