Drop empty sealed segment (#17708)

[sunby]

issue: #17508

Signed-off-by: sunby bingyi.sun@zilliz.com

Co-authored-by: sunby bingyi.sun@zilliz.com

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[codecov]

Codecov Report

Merging #17782 (017846e) into 2.1.0 (6c47ea2) will increase coverage by 0.01%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##            2.1.0   #17782      +/-   ##
==========================================
+ Coverage   81.09%   81.10%   +0.01%     
==========================================
  Files         469      469              
  Lines       74586    74604      +18     
==========================================
+ Hits        60483    60507      +24     
+ Misses      11424    11416       -8     
- Partials     2679     2681       +2     

Impacted Files	Coverage Δ
internal/datacoord/segment_manager.go	85.88% <100.00%> (+1.75%)	⬆️
internal/datacoord/services.go	86.45% <100.00%> (ø)
internal/mq/mqimpl/rocksmq/client/client_impl.go	77.96% <0.00%> (-2.55%)	⬇️
internal/indexnode/indexnode_mock.go	83.65% <0.00%> (-1.15%)	⬇️
internal/indexcoord/index_coord.go	77.82% <0.00%> (-0.64%)	⬇️
internal/querycoord/index_checker.go	74.25% <0.00%> (-0.60%)	⬇️
internal/querycoord/meta.go	79.95% <0.00%> (-0.43%)	⬇️
internal/datacoord/meta.go	87.09% <0.00%> (+0.12%)	⬆️
internal/datacoord/server.go	76.19% <0.00%> (+0.65%)	⬆️
internal/indexcoord/meta_table.go	85.18% <0.00%> (+0.69%)	⬆️
... and 5 more

[congqixia]

/kind bug

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