remove unused metadata reducer file
remove unused metadata reducer file

rgbkrk/nteract,captainsafia/nteract,nteract/nteract,nteract/nteract,nteract/composition,jdfreder/nteract,nteract/composition,rgbkrk/nteract,nteract/nteract,jdetle/nteract,nteract/nteract,nteract/nteract,rgbkrk/nteract,rgbkrk/nteract,jdfreder/nteract,jdetle/nteract,nteract/composition,captainsafia/nteract,jdetle/nteract,jdfreder/nteract,captainsafia/nteract,captainsafia/nteract,jdfreder/nteract,rgbkrk/nteract,jdetle/nteract