fix: Revert a optimize in clustering compaction

[wayblink]

#30633

[xiaocai2333]

/lgtm

[xiaocai2333]

rerun ut

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 80.83%. Comparing base (e5d691d) to head (0091aca). Report is 20 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master   #34299      +/-   ##
==========================================
+ Coverage   80.44%   80.83%   +0.39%     
==========================================
  Files        1086     1084       -2     
  Lines      137670   137522     -148     
==========================================
+ Hits       110744   111168     +424     
+ Misses      22756    22151     -605     
- Partials     4170     4203      +33     

Files	Coverage Δ
internal/datacoord/compaction_task_clustering.go	47.07% <100.00%> (+21.05%)	:arrow_up:

... and 123 files with indirect coverage changes

[congqixia]

/approve

[sre-ci-robot]

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