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

[xiaocai2333]

issue: #34648

master pr: #34649
2.4 pr: #34651

[xiaocai2333]

/run-cpu-e2e

[xiaocai2333]

/run-cpu-e2e

[codecov]

Codecov Report

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

Project coverage is 81.96%. Comparing base (7f47f0d) to head (a5c3ee1).

Additional details and impacted files

@@               Coverage Diff                @@
##           hotfix-2.4.5   #34652      +/-   ##
================================================
+ Coverage         81.94%   81.96%   +0.01%     
================================================
  Files              1015     1015              
  Lines            129462   129475      +13     
================================================
+ Hits             106094   106120      +26     
+ Misses            19363    19353      -10     
+ Partials           4005     4002       -3     

Files	Coverage Δ
internal/datacoord/segment_manager.go	85.75% <50.00%> (-1.65%)	⬇️

... and 21 files with indirect coverage changes

[xiaofan-luan]

/lgtm
/approve

[sre-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

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