[skip e2e] Optimize test_reduce

[cydrain]

Signed-off-by: yudong.cai yudong.cai@zilliz.com
Issue: #17599

[mergify]

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

[codecov]

Codecov Report

Merging #18957 (777baa7) into master (0e4e796) will increase coverage by 0.01%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master   #18957      +/-   ##
==========================================
+ Coverage   81.19%   81.20%   +0.01%     
==========================================
  Files         540      540              
  Lines       81581    81581              
==========================================
+ Hits        66242    66251       +9     
+ Misses      12487    12480       -7     
+ Partials     2852     2850       -2     

Impacted Files	Coverage Δ
internal/mq/mqimpl/rocksmq/client/client_impl.go	77.96% <0.00%> (-2.55%)	⬇️
internal/proxy/util.go	87.52% <0.00%> (-0.59%)	⬇️
internal/mq/msgstream/mq_msgstream.go	79.17% <0.00%> (-0.15%)	⬇️
internal/datacoord/server.go	76.79% <0.00%> (+0.65%)	⬆️
internal/datacoord/segment_manager.go	84.21% <0.00%> (+1.38%)	⬆️
internal/proxy/segment.go	89.39% <0.00%> (+1.51%)	⬆️
internal/proxy/channels_time_ticker.go	82.83% <0.00%> (+2.23%)	⬆️

[congqixia]

/kind improvement

[congqixia]

/lgtm

[sre-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

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