fix: [2.5] Querycoord will trigger unexpected balance task after restart

[weiliu1031]

issue: #38606
pr: #38630

[sre-ci-robot]

[APPROVALNOTIFIER] This PR is NOT APPROVED

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[weiliu1031]

duplicate pr by mistake

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 81.05%. Comparing base (9113090) to head (c023971).
Report is 1 commits behind head on 2.5.

Additional details and impacted files

@@            Coverage Diff             @@
##              2.5   #38723      +/-   ##
==========================================
- Coverage   81.06%   81.05%   -0.01%     
==========================================
  Files        1381     1381              
  Lines      195103   195105       +2     
==========================================
- Hits       158156   158141      -15     
- Misses      31390    31402      +12     
- Partials     5557     5562       +5     

Components	Coverage Δ
Client	78.26% <ø> (ø)
Core	69.33% <ø> (-0.02%)	⬇️
Go	83.03% <100.00%> (-0.01%)	⬇️

Files with missing lines	Coverage Δ
internal/querycoordv2/meta/target.go	95.04% <100.00%> (+0.08%)	⬆️

... and 22 files with indirect coverage changes