refine balance to replica granuity

[MrPresent-Han]

related: #23454

[mergify[bot]]

@MrPresent-Han Thanks for your contribution. Please submit with DCO, see the contributing guide https://github.com/milvus-io/milvus/blob/master/CONTRIBUTING.md#developer-certificate-of-origin-dco.

[mergify[bot]]

@MrPresent-Han ut workflow job failed, comment rerun ut can trigger the job again.

[mergify[bot]]

@MrPresent-Han E2e jenkins job failed, comment /run-cpu-e2e can trigger the job again.

[mergify[bot]]

@MrPresent-Han E2e jenkins job failed, comment /run-cpu-e2e can trigger the job again.

[mergify[bot]]

@MrPresent-Han ut workflow job failed, comment rerun ut can trigger the job again.

[mergify[bot]]

@MrPresent-Han ut workflow job failed, comment rerun ut can trigger the job again.

[MrPresent-Han]

rerun ut

[mergify[bot]]

@MrPresent-Han E2e jenkins job failed, comment /run-cpu-e2e can trigger the job again.

[codecov[bot]]

Codecov Report

Merging #23629 (022d313) into 2.2.0 (cb82783) will decrease coverage by 0.02%. The diff coverage is 92.30%.

@@            Coverage Diff             @@
##            2.2.0   #23629      +/-   ##
==========================================
- Coverage   80.62%   80.60%   -0.02%     
==========================================
  Files         717      717              
  Lines      101499   101509      +10     
==========================================
- Hits        81837    81826      -11     
- Misses      16451    16467      +16     
- Partials     3211     3216       +5     

Impacted Files	Coverage Δ
internal/metrics/querycoord_metrics.go	100.00% <ø> (ø)
internal/querycoordv2/task/scheduler.go	78.00% <66.66%> (-0.54%)	:arrow_down:
internal/querycoordv2/balance/utils.go	76.25% <100.00%> (ø)
internal/querycoordv2/checkers/balance_checker.go	97.53% <100.00%> (ø)
internal/querycoordv2/job/job.go	84.11% <100.00%> (+0.23%)	:arrow_up:
internal/querycoordv2/task/executor.go	69.66% <100.00%> (ø)

... and 14 files with indirect coverage changes

[MrPresent-Han]

/run-cpu-e2e

[mergify[bot]]

@MrPresent-Han E2e jenkins job failed, comment /run-cpu-e2e can trigger the job again.

[MrPresent-Han]

/run-cpu-e2e

[sre-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: congqixia, MrPresent-Han

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