some filter should run once

[bufferflies]

The storeStateFilter, SpecialUseFilter, RegionScoreFilter can be run once , not every target.
some related code:

pd/server/schedulers/balance_region.go

Lines 230 to 236 in 0433eea

	filters := []filter.Filter{
	filter.NewExcludedFilter(s.GetName(), nil, solver.region.GetStoreIDs()),
	filter.NewPlacementSafeguard(s.GetName(), solver.GetOpts(), solver.GetBasicCluster(), solver.GetRuleManager(), solver.region, solver.source),
	filter.NewRegionScoreFilter(s.GetName(), solver.source, solver.GetOpts()),
	filter.NewSpecialUseFilter(s.GetName()),
	&filter.StoreStateFilter{ActionScope: s.GetName(), MoveRegion: true},
	}