Optimize log when rootcoord goroutine quit (#23698)

[longjiquan]

/kind improvement

[sre-ci-robot]

@longjiquan: The label(s) kind/improment cannot be applied, because the repository doesn't have them.

In response to this:

/kind improment

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[mergify[bot]]

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

[longjiquan]

/kind improvement

[mergify[bot]]

@longjiquan ut workflow job failed, comment rerun ut can trigger the job again.

[longjiquan]

rerun ut

[mergify[bot]]

@longjiquan ut workflow job failed, comment rerun ut can trigger the job again.

[longjiquan]

rerun ut

[codecov[bot]]

Codecov Report

Merging #23699 (45c76c2) into 2.2.0 (51f5a12) will decrease coverage by 0.29%. The diff coverage is 100.00%.

@@            Coverage Diff             @@
##            2.2.0   #23699      +/-   ##
==========================================
- Coverage   80.89%   80.61%   -0.29%     
==========================================
  Files         718      713       -5     
  Lines      101217   101290      +73     
==========================================
- Hits        81879    81653     -226     
- Misses      16139    16437     +298     
- Partials     3199     3200       +1     

Impacted Files	Coverage Δ
internal/rootcoord/root_coord.go	78.00% <100.00%> (+0.02%)	:arrow_up:

... and 94 files with indirect coverage changes

[czs007]

/approve /lgtm

[sre-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

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

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