fix: [2.5] Reset compacting when finishing segment stats

[congqixia]

Cherry-pick from master
pr: #41963
Related to #41962

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 80.64%. Comparing base (00336a8) to head (f8d9855).
Report is 31 commits behind head on 2.5.

Additional details and impacted files

@@           Coverage Diff           @@
##              2.5   #42005   +/-   ##
=======================================
  Coverage   80.63%   80.64%           
=======================================
  Files        1427     1427           
  Lines      205253   205255    +2     
=======================================
+ Hits       165513   165527   +14     
+ Misses      33920    33911    -9     
+ Partials     5820     5817    -3     

Components	Coverage Δ
Client	79.42% <ø> (ø)
Core	70.67% <ø> (ø)
Go	82.60% <100.00%> (+<0.01%)	⬆️

Files with missing lines	Coverage Δ
internal/datacoord/task_stats.go	87.41% <100.00%> (+0.08%)	⬆️

... and 22 files with indirect coverage changes

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[czs007]

/lgtm

[sre-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

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