enhance: Refine code for get_deleted_bitmap

[xiaocai2333]

issue: #33744

Check whether the PK is truly sorted in the debug model.

[czs007]

/approve

[xiaocai2333]

rerun ut

[codecov]

Codecov Report

Attention: Patch coverage is 17.64706% with 14 lines in your changes missing coverage. Please review.

Project coverage is 72.36%. Comparing base (277c50f) to head (9e24ad3).
Report is 91 commits behind head on master.

Files with missing lines	Patch %	Lines
internal/core/src/segcore/SegmentSealedImpl.cpp	0.00%	14 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master   #36819      +/-   ##
==========================================
- Coverage   72.52%   72.36%   -0.17%     
==========================================
  Files        1308     1310       +2     
  Lines      156362   183527   +27165     
==========================================
+ Hits       113407   132808   +19401     
- Misses      37840    45599    +7759     
- Partials     5115     5120       +5     

Files with missing lines	Coverage Δ
internal/core/src/segcore/SegmentSealedImpl.h	12.50% <ø> (ø)
internal/core/src/segcore/Utils.h	82.85% <100.00%> (+1.03%)	⬆️
internal/core/src/segcore/SegmentSealedImpl.cpp	0.00% <0.00%> (ø)

... and 1162 files with indirect coverage changes

[czs007]

/approve
/lgtm

[sre-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: czs007, xiaocai2333

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