consider moving hot regions first if we delete a TiKV
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Description
Now if we delete a TiKV, PD will begin to move regions in this TiKV to other TiKVs, this will take a long time. But if some regions are hot and split frequently, the region count reported in the TiKV will be increased, this may confuse the user.
Maybe we should consider moving hot regions at first.
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