enhance: Rename preAllocatedSegments

[bigsheeper]

Rename preAllocatedSegments to preAllocatedSegmentIDs to avoid confusion.

[codecov]

Codecov Report

Attention: Patch coverage is 83.33333% with 1 line in your changes missing coverage. Please review.

Project coverage is 81.40%. Comparing base (311f860) to head (cd7ded0).
Report is 4 commits behind head on master.

Files with missing lines	Patch %	Lines
internal/datanode/services.go	50.00%	0 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master   #35871      +/-   ##
==========================================
+ Coverage   79.84%   81.40%   +1.55%     
==========================================
  Files        1239     1252      +13     
  Lines      148031   149322    +1291     
==========================================
+ Hits       118194   121554    +3360     
+ Misses      25005    22906    -2099     
- Partials     4832     4862      +30     

Files with missing lines	Coverage Δ
internal/datacoord/compaction_task_clustering.go	79.68% <100.00%> (+2.60%)	⬆️
internal/datacoord/compaction_task_mix.go	64.25% <100.00%> (+7.23%)	⬆️
...ternal/datanode/compaction/clustering_compactor.go	67.45% <100.00%> (+2.25%)	⬆️
internal/datanode/compaction/mix_compactor.go	77.12% <100.00%> (+3.92%)	⬆️
internal/datanode/services.go	85.94% <50.00%> (+12.43%)	⬆️

... and 223 files with indirect coverage changes

[czs007]

/approve
/lgtm

[sre-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

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

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