HistoryLoads check are always skipped during hot_region_scheduler

## Bug Report



An accidental modification resulted in historyLoads not being assigned a value. ref https://github.com/tikv/pd/pull/8345

<img width="1455" alt="Image" src="https://github.com/user-attachments/assets/5a12fb88-a0bf-4657-a1de-c581dfee10a4" />


https://github.com/tikv/pd/blob/abcb383fc0ce3bd44cef09aaf99add043ea8fad7/pkg/schedule/schedulers/hot_region.go#L822-L825

https://github.com/tikv/pd/blob/abcb383fc0ce3bd44cef09aaf99add043ea8fad7/pkg/schedule/schedulers/hot_region.go#L1061-L1064

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Uh oh!

HistoryLoads check are always skipped during hot_region_scheduler #9270

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	func (bs balanceSolver) checkSrcHistoryLoadsByPriorityAndTolerance(current, expectLoad statistics.StoreLoad, toleranceRatio float64) bool {
	if len(current.HistoryLoads) == 0 {
	return true
	}

	func (bs balanceSolver) checkDstHistoryLoadsByPriorityAndTolerance(current, expect statistics.StoreLoad, toleranceRatio float64) bool {
	if len(current.HistoryLoads) == 0 {
	return true
	}

HistoryLoads check are always skipped during hot_region_scheduler #9270

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What version of PD are you using (`pd-server -V`)?