scheduler: hot-region-scheduler store pick consider the history loads to decrease incorrect operator

[bufferflies]

What problem does this PR solve?

Issue Number: Close #6297

What is changed and how does it work?

Check List

Tests

• Unit test
• Integration test
• Manual test (add detailed scripts or steps below)
• No code

Code changes

Side effects

Related changes

Release note

None.

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[codecov]

Codecov Report

Patch coverage: 82.22% and project coverage change: +0.13 🎉

Comparison is base (bfdc7ec) 75.09% compared to head (08aa49a) 75.22%.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #6276      +/-   ##
==========================================
+ Coverage   75.09%   75.22%   +0.13%     
==========================================
  Files         404      404              
  Lines       39350    39538     +188     
==========================================
+ Hits        29549    29742     +193     
- Misses       7228     7229       +1     
+ Partials     2573     2567       -6     

Flag	Coverage Δ
unittests	75.22% <82.22%> (+0.13%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
pkg/movingaverage/exponential_moving_average.go	96.42% <0.00%> (-3.58%)	⬇️
pkg/movingaverage/hull_moving_average.go	95.23% <0.00%> (-4.77%)	⬇️
pkg/movingaverage/weight_moving_average.go	82.75% <0.00%> (-9.55%)	⬇️
pkg/statistics/store_load.go	97.97% <ø> (ø)
server/handler.go	52.38% <0.00%> (-0.41%)	⬇️
pkg/movingaverage/max_filter.go	85.00% <66.66%> (-3.24%)	⬇️
pkg/movingaverage/median_filter.go	96.29% <66.66%> (-3.71%)	⬇️
pkg/schedule/schedulers/hot_region.go	84.08% <80.39%> (-0.42%)	⬇️
pkg/statistics/store.go	90.76% <92.30%> (+0.17%)	⬆️
pkg/statistics/collector.go	93.58% <93.33%> (-0.17%)	⬇️
... and 5 more

... and 25 files with indirect coverage changes

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[bufferflies]

/closed by #6314