enhance: [cherry-pick] Refine clustering compaction latency metrics

[wayblink]

issue: #34527
pr: #34528

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 80.74%. Comparing base (15adb2f) to head (403ed41).
Report is 7 commits behind head on 2.4.

Additional details and impacted files

@@            Coverage Diff             @@
##              2.4   #34539      +/-   ##
==========================================
- Coverage   80.74%   80.74%   -0.01%     
==========================================
  Files        1051     1051              
  Lines      135835   135835              
==========================================
- Hits       109678   109677       -1     
  Misses      21945    21945              
- Partials     4212     4213       +1     

Files	Coverage Δ
internal/datacoord/compaction_task_clustering.go	47.33% <100.00%> (ø)
pkg/metrics/datacoord_metrics.go	65.07% <ø> (ø)

... and 24 files with indirect coverage changes

[czs007]

/approve
/lgtm

[sre-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

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

The full list of commands accepted by this bot can be found here.

The pull request process is described here

Needs approval from an approver in each of these files:

• OWNERS [czs007]

Approvers can indicate their approval by writing /approve in a comment
Approvers can cancel approval by writing /approve cancel in a comment