Remove unused constants.
Remove unused constants.

These strings were used in the project.json days, but are no longer used.

ravimeda/cli,dasMulli/cli,livarcocc/cli-1,svick/cli,harshjain2/cli,dasMulli/cli,EdwardBlair/cli,harshjain2/cli,svick/cli,svick/cli,blackdwarf/cli,Faizan2304/cli,ravimeda/cli,harshjain2/cli,blackdwarf/cli,blackdwarf/cli,Faizan2304/cli,EdwardBlair/cli,Faizan2304/cli,blackdwarf/cli,dasMulli/cli,johnbeisner/cli,livarcocc/cli-1,ravimeda/cli,EdwardBlair/cli,johnbeisner/cli,livarcocc/cli-1,johnbeisner/cli