Seal by segment size instead of row number

[wayblink]

related: #23587

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[codecov[bot]]

Codecov Report

Merging #23854 (d0a895d) into master (38f45c3) will increase coverage by 0.01%. The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master   #23854      +/-   ##
==========================================
+ Coverage   79.80%   79.81%   +0.01%     
==========================================
  Files         744      744              
  Lines       97577    97582       +5     
==========================================
+ Hits        77867    77882      +15     
+ Misses      16551    16545       -6     
+ Partials     3159     3155       -4     

Impacted Files	Coverage Δ
internal/datacoord/segment_allocation_policy.go	82.52% <100.00%> (-6.37%)	:arrow_down:
internal/datacoord/segment_manager.go	87.97% <100.00%> (-1.34%)	:arrow_down:

... and 14 files with indirect coverage changes

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