fix: [2.4] Fix inaccurate general count

[bigsheeper]

Checking general count should only count healthy collections and partitions.

issue: #37630

pr: #38524

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 80.38%. Comparing base (6f573f6) to head (0daee25).
Report is 4 commits behind head on 2.4.

Additional details and impacted files

@@            Coverage Diff             @@
##              2.4   #38525      +/-   ##
==========================================
+ Coverage   72.15%   80.38%   +8.22%     
==========================================
  Files        1077     1077              
  Lines      169342   169344       +2     
==========================================
+ Hits       122185   136122   +13937     
+ Misses      42685    28750   -13935     
  Partials     4472     4472              

Files with missing lines	Coverage Δ
internal/rootcoord/meta_table.go	83.97% <100.00%> (+0.10%)	⬆️

... and 229 files with indirect coverage changes

[czs007]

/approve
/lgtm

[sre-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

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