Fix input constructor for qMultiFidelityKnowledgeGradient
          #2519
        
          
      
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Summary:
The input constructor for
qMultiFidelityKnowledgeGradientwas computingcurrent_valuein a manner that was effectively not fidelity-aware (the fidelity dimension was not fixed in the optimization done to obtaincurrent_value), since it was simply re-using functionality from the input constructor forconstruct_inputs_qKG.This diff addresses this by making use of
target_fidelitiesas thefixed_featuresargument toD62380369.Differential Revision: D62391106