fix: [cherry-pick] Remove flushed segment in segment manager generated through import

[xiaocai2333]

issue: #34648

master pr: #34649

[mergify]

@xiaocai2333 E2e jenkins job failed, comment /run-cpu-e2e can trigger the job again.

[codecov]

Codecov Report

Attention: Patch coverage is 50.00000% with 7 lines in your changes missing coverage. Please review.

Project coverage is 84.40%. Comparing base (4e02e57) to head (fcebd5c).
Report is 3 commits behind head on 2.4.

Additional details and impacted files

@@             Coverage Diff             @@
##              2.4   #34651       +/-   ##
===========================================
+ Coverage   69.74%   84.40%   +14.66%     
===========================================
  Files        1045      786      -259     
  Lines      136250   112551    -23699     
===========================================
- Hits        95021    94994       -27     
+ Misses      37018    13338    -23680     
- Partials     4211     4219        +8     

Files	Coverage Δ
internal/datacoord/segment_manager.go	86.52% <50.00%> (-0.88%)	⬇️

... and 285 files with indirect coverage changes

[xiaofan-luan]

/lgtm
/approve

[sre-ci-robot]

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