Remove references to Microsoft.VisualStudio.LanguageServices.SolutionExplorer
Remove references to Microsoft.VisualStudio.LanguageServices.SolutionExplorer

We don't need to OptProf train it anymore now that it doesn't exist.

diryboy/roslyn,dotnet/roslyn,tmat/roslyn,mavasani/roslyn,mavasani/roslyn,AlekseyTs/roslyn,stephentoub/roslyn,jasonmalinowski/roslyn,wvdd007/roslyn,panopticoncentral/roslyn,AmadeusW/roslyn,tannergooding/roslyn,CyrusNajmabadi/roslyn,KirillOsenkov/roslyn,tannergooding/roslyn,mavasani/roslyn,tmat/roslyn,CyrusNajmabadi/roslyn,eriawan/roslyn,gafter/roslyn,dotnet/roslyn,panopticoncentral/roslyn,eriawan/roslyn,heejaechang/roslyn,ErikSchierboom/roslyn,tannergooding/roslyn,AlekseyTs/roslyn,sharwell/roslyn,bartdesmet/roslyn,shyamnamboodiripad/roslyn,physhi/roslyn,heejaechang/roslyn,AmadeusW/roslyn,tmat/roslyn,ErikSchierboom/roslyn,stephentoub/roslyn,jasonmalinowski/roslyn,weltkante/roslyn,diryboy/roslyn,heejaechang/roslyn,panopticoncentral/roslyn,KevinRansom/roslyn,gafter/roslyn,mgoertz-msft/roslyn,physhi/roslyn,weltkante/roslyn,dotnet/roslyn,ErikSchierboom/roslyn,CyrusNajmabadi/roslyn,eriawan/roslyn,wvdd007/roslyn,physhi/roslyn,diryboy/roslyn,mgoertz-msft/roslyn,KevinRansom/roslyn,gafter/roslyn,KirillOsenkov/roslyn,wvdd007/roslyn,KirillOsenkov/roslyn,jasonmalinowski/roslyn,shyamnamboodiripad/roslyn,shyamnamboodiripad/roslyn,bartdesmet/roslyn,KevinRansom/roslyn,bartdesmet/roslyn,AlekseyTs/roslyn,AmadeusW/roslyn,sharwell/roslyn,mgoertz-msft/roslyn,weltkante/roslyn,sharwell/roslyn,stephentoub/roslyn