fix: sync part stats task cannot be finished(#30376)

[MrPresent-Han]

related: #30376
also: refine log output for query_coord task by rephrasing action string

[mergify]

@MrPresent-Han ut workflow job failed, comment rerun ut can trigger the job again.

[codecov]

Codecov Report

Attention: Patch coverage is 83.87097% with 5 lines in your changes missing coverage. Please review.

Project coverage is 80.96%. Comparing base (2f6f964) to head (774d836).
Report is 41 commits behind head on master.

❗ Current head 774d836 differs from pull request most recent head 957b687

Please upload reports for the commit 957b687 to get more accurate results.

Additional details and impacted files

@@            Coverage Diff             @@
##           master   #34027      +/-   ##
==========================================
+ Coverage   80.92%   80.96%   +0.04%     
==========================================
  Files        1062     1064       +2     
  Lines      136133   136560     +427     
==========================================
+ Hits       110168   110570     +402     
+ Misses      21788    21782       -6     
- Partials     4177     4208      +31     

Files	Coverage Δ
internal/querycoordv2/task/task.go	97.70% <100.00%> (-0.07%)	⬇️
internal/querynodev2/delegator/delegator.go	86.87% <100.00%> (+0.02%)	⬆️
internal/storage/partition_stats.go	81.39% <100.00%> (+0.90%)	⬆️
pkg/common/map.go	100.00% <100.00%> (ø)
internal/querynodev2/delegator/segment_pruner.go	68.42% <50.00%> (+0.20%)	⬆️
internal/querycoordv2/task/action.go	90.17% <76.92%> (-2.68%)	⬇️

... and 53 files with indirect coverage changes

[congqixia]

/lgtm

[sre-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: congqixia, MrPresent-Han

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[czs007]

@MrPresent-Han please pick after major compaction been picked