fix: fix rootcoord_entity_num metric bug

[presburger]

#45579

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[codecov[bot]]

Codecov Report

:white_check_mark: All modified and coverable lines are covered by tests. :white_check_mark: Project coverage is 76.00%. Comparing base (dff62c5) to head (c619e66). :warning: Report is 46 commits behind head on master.

:x: Your project check has failed because the head coverage (76.00%) is below the target coverage (77.00%). You can increase the head coverage or adjust the target coverage.

Additional details and impacted files

@@             Coverage Diff             @@
##           master   #45983       +/-   ##
===========================================
- Coverage   82.73%   76.00%    -6.73%     
===========================================
  Files         524     1888     +1364     
  Lines       82291   294943   +212652     
===========================================
+ Hits        68082   224179   +156097     
- Misses      14209    63332    +49123     
- Partials        0     7432     +7432     

Components	Coverage Δ
Client	78.17% <ø> (∅)
Core	82.73% <ø> (ø)
Go	74.06% <45.16%> (∅)

Files with missing lines	Coverage Δ
internal/rootcoord/quota_center.go	79.25% <100.00%> (ø)

... and 1363 files with indirect coverage changes

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