enhance: Limit the speed of the generating stats task

[xiaocai2333]

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[sre-ci-robot]

[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by: xiaocai2333
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[mergify]

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[codecov]

Codecov Report

Attention: Patch coverage is 87.50000% with 2 lines in your changes missing coverage. Please review.

Project coverage is 80.14%. Comparing base (13cffaf) to head (c78d3a6).
Report is 3 commits behind head on master.

Files with missing lines	Patch %	Lines
internal/datacoord/job_manager.go	0.00%	1 Missing and 1 partial ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##           master   #39644       +/-   ##
===========================================
+ Coverage   69.39%   80.14%   +10.74%     
===========================================
  Files         302     1476     +1174     
  Lines       27077   204392   +177315     
===========================================
+ Hits        18790   163802   +145012     
- Misses       8287    34740    +26453     
- Partials        0     5850     +5850     

Components	Coverage Δ
Client	79.44% <ø> (∅)
Core	69.39% <ø> (ø)
Go	81.87% <87.50%> (∅)

Files with missing lines	Coverage Δ
internal/datacoord/task_scheduler.go	95.84% <100.00%> (ø)
pkg/util/paramtable/component_param.go	98.29% <100.00%> (ø)
internal/datacoord/job_manager.go	75.78% <0.00%> (ø)

... and 1171 files with indirect coverage changes

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[xiaocai2333]

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