enhance: add detail, replica count for resource group

[chyezh]

issue: #30647
pr: #38314

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 80.42%. Comparing base (0c442b6) to head (c364ada).
Report is 25 commits behind head on 2.4.

Additional details and impacted files

@@            Coverage Diff             @@
##              2.4   #38315      +/-   ##
==========================================
+ Coverage   80.41%   80.42%   +0.01%     
==========================================
  Files        1074     1077       +3     
  Lines      168774   169330     +556     
==========================================
+ Hits       135716   136181     +465     
- Misses      28615    28684      +69     
- Partials     4443     4465      +22     

Files with missing lines	Coverage Δ
internal/querycoordv2/meta/replica_manager.go	82.73% <100.00%> (+0.52%)	⬆️
internal/querycoordv2/meta/resource_manager.go	82.76% <100.00%> (+0.57%)	⬆️
pkg/metrics/metrics.go	100.00% <ø> (ø)
pkg/metrics/querycoord_metrics.go	100.00% <100.00%> (ø)
pkg/metrics/querynode_metrics.go	100.00% <ø> (ø)

... and 75 files with indirect coverage changes

[weiliu1031]

/lgtm

[jaime0815]

/lgtm

[sre-ci-robot]

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