fix: Avoid datarace in clustering compaction

[wayblink]

#34289

[mergify[bot]]

@wayblink Please associate the related issue to the body of your Pull Request. (eg. “issue: #”)

[mergify[bot]]

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

[wayblink]

rerun ut

[mergify[bot]]

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

[wayblink]

/run-cpu-e2e

[mergify[bot]]

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

[codecov[bot]]

Codecov Report

Attention: Patch coverage is 80.00000% with 2 lines in your changes missing coverage. Please review.

Project coverage is 80.51%. Comparing base (fa8d641) to head (15c5b8e). Report is 10 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master   #34288      +/-   ##
==========================================
- Coverage   80.53%   80.51%   -0.02%     
==========================================
  Files        1095     1095              
  Lines      137835   137839       +4     
==========================================
- Hits       111003   110986      -17     
- Misses      22683    22702      +19     
- Partials     4149     4151       +2     

Files	Coverage Δ
internal/datacoord/compaction_task.go	66.66% <100.00%> (+9.52%)	:arrow_up:
internal/datacoord/compaction_task_clustering.go	25.88% <50.00%> (-0.14%)	:arrow_down:

... and 26 files with indirect coverage changes

[czs007]

/approve /lgtm

[sre-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

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