Fixed mean_cache data extraction for dKG
          #2452
        
          
      
                
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Issue: dKG in BoTorch no longer works since I last ran it a few months ago. It appears to be from the
mean_cachegoing from size[num_fantasies, 1, 1, num_data]to[num_fantasies, num_fantasies, num_fantasies, num_data]. What this change does is extract the relevant data ofmean_cachewhile keeping the expected shape for the rest of the code (ie.[num_fantasies, 1, num_data]).Not sure about a unit test for this since it depends on having BoTorch's
qKnowledgeGradientclass, among other dependencies.See meta-pytorch/botorch#2137