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.

[czs007]

/run-cpu-e2e

[mergify]

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

[xiaocai2333]

/run-cpu-e2e

[mergify]

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

[xiaocai2333]

/run-cpu-e2e

[xiaocai2333]

/run-cpu-e2e

[mergify]

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

[xiaocai2333]

/run-cpu-e2e

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 83.09%. Comparing base (7f3a2a2) to head (b60edd3).
Report is 2 commits behind head on 2.3.

Additional details and impacted files

@@            Coverage Diff             @@
##              2.3   #34650      +/-   ##
==========================================
- Coverage   83.10%   83.09%   -0.01%     
==========================================
  Files         851      851              
  Lines      107143   107156      +13     
==========================================
+ Hits        89038    89044       +6     
- Misses      14786    14794       +8     
+ Partials     3319     3318       -1     

Files	Coverage Δ
internal/datacoord/segment_manager.go	92.83% <100.00%> (-0.60%)	⬇️

... and 19 files with indirect coverage changes

[xiaofan-luan]

/lgtm
/approve

[sre-ci-robot]

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