Fix datanode/datacoord continuous restart

[SimFG]

issue: #25905

[codecov]

Codecov Report

Merging #26470 (26aeeb3) into master (3b11ad2) will decrease coverage by 0.01%.
Report is 3 commits behind head on master.
The diff coverage is 12.50%.

@@            Coverage Diff             @@
##           master   #26470      +/-   ##
==========================================
- Coverage   79.87%   79.86%   -0.01%     
==========================================
  Files         821      821              
  Lines      112322   112328       +6     
==========================================
- Hits        89712    89707       -5     
- Misses      19408    19414       +6     
- Partials     3202     3207       +5     

Files Changed	Coverage Δ
internal/datacoord/handler.go	83.50% <0.00%> (-0.30%)	⬇️
internal/datanode/data_sync_service.go	78.50% <0.00%> (-0.78%)	⬇️
internal/datanode/event_manager.go	81.25% <33.33%> (-1.73%)	⬇️

... and 16 files with indirect coverage changes

[xiaofan-luan]

/lgtm
/approve

[sre-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: SimFG, xiaofan-luan

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