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

[weiliu1031]

issue: #38606
pr: #38630

[mergify]

@weiliu1031 go-sdk check failed, comment rerun go-sdk can trigger the job again.

[weiliu1031]

rerun go-sdk

[codecov]

Codecov Report

Attention: Patch coverage is 82.35294% with 6 lines in your changes missing coverage. Please review.

Project coverage is 81.06%. Comparing base (9113090) to head (0b1e1d7).
Report is 4 commits behind head on 2.5.

Files with missing lines	Patch %	Lines
internal/querycoordv2/meta/target.go	66.66%	4 Missing and 2 partials ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##              2.5   #38725      +/-   ##
==========================================
- Coverage   81.06%   81.06%   -0.01%     
==========================================
  Files        1381     1381              
  Lines      195103   195137      +34     
==========================================
+ Hits       158156   158180      +24     
- Misses      31390    31397       +7     
- Partials     5557     5560       +3     

Components	Coverage Δ
Client	78.26% <ø> (ø)
Core	69.33% <ø> (-0.02%)	⬇️
Go	83.04% <82.35%> (-0.01%)	⬇️

Files with missing lines	Coverage Δ
internal/querycoordv2/checkers/balance_checker.go	96.26% <100.00%> (+0.30%)	⬆️
internal/querycoordv2/meta/target_manager.go	89.45% <100.00%> (+0.18%)	⬆️
internal/querycoordv2/meta/target.go	90.76% <66.66%> (-4.19%)	⬇️

... and 24 files with indirect coverage changes

[tedxu]

/lgtm
/approve

[sre-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

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

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Needs approval from an approver in each of these files:

• internal/proto/OWNERS [tedxu]
• internal/querycoordv2/balance/OWNERS [tedxu]
• internal/querycoordv2/checkers/OWNERS [tedxu]
• internal/querycoordv2/meta/OWNERS [tedxu]

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