Fix the `not shard leader` error when gracefully stopping

[SimFG]

/kind improvement

[mergify[bot]]

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

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[SimFG]

/kind improvement

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[SimFG]

rerun ut

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[SimFG]

rerun ut

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[codecov[bot]]

Codecov Report

Merging #24038 (3890e3a) into 2.2.0 (5a3e41c) will increase coverage by 0.02%. The diff coverage is 100.00%.

@@            Coverage Diff             @@
##            2.2.0   #24038      +/-   ##
==========================================
+ Coverage   80.58%   80.61%   +0.02%     
==========================================
  Files         736      736              
  Lines      103285   103290       +5     
==========================================
+ Hits        83234    83265      +31     
+ Misses      16839    16811      -28     
- Partials     3212     3214       +2     

Impacted Files	Coverage Δ
internal/proxy/task_search.go	78.37% <100.00%> (+0.54%)	:arrow_up:

... and 18 files with indirect coverage changes

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[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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