enhance: Remove deprecated DataCoordNumStoredRowsCounter metric (#31778)

[bigsheeper]

pr: #31778

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 80.89%. Comparing base (e3b6520) to head (b7f9f7c).
Report is 9 commits behind head on 2.4.

Additional details and impacted files

@@            Coverage Diff             @@
##              2.4   #31935      +/-   ##
==========================================
+ Coverage   80.62%   80.89%   +0.26%     
==========================================
  Files         976      976              
  Lines      139302   139298       -4     
==========================================
+ Hits       112319   112686     +367     
+ Misses      23223    22866     -357     
+ Partials     3760     3746      -14     

Files	Coverage Δ
internal/datacoord/meta.go	93.35% <ø> (-0.02%)	⬇️
pkg/metrics/datacoord_metrics.go	100.00% <ø> (ø)

... and 39 files with indirect coverage changes

[czs007]

/approve
/lgtm

[sre-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

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