fix: unstable ut in leader_vew_manager.go file

[jaime0815]

issue: #38672
pr: #39161

[chyezh]

/lgtm

[sre-ci-robot]

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[mergify]

@jaime0815 go-sdk check failed, comment rerun go-sdk can trigger the job again.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 81.06%. Comparing base (a43720f) to head (6cece25).
Report is 1 commits behind head on 2.5.

Additional details and impacted files

@@            Coverage Diff             @@
##              2.5   #39162      +/-   ##
==========================================
- Coverage   81.06%   81.06%   -0.01%     
==========================================
  Files        1389     1389              
  Lines      196350   196349       -1     
==========================================
- Hits       159175   159174       -1     
  Misses      31569    31569              
  Partials     5606     5606              

Components	Coverage Δ
Client	78.26% <ø> (ø)
Core	69.55% <ø> (ø)
Go	83.03% <100.00%> (-0.01%)	⬇️

Files with missing lines	Coverage Δ
internal/querycoordv2/meta/leader_view_manager.go	93.57% <100.00%> (-0.03%)	⬇️

... and 25 files with indirect coverage changes