Add missing slash to the end of $(NuGetPackageRoot) (#18511)
Add missing slash to the end of $(NuGetPackageRoot) (#18511)

Some NuGet targets also use this property and they expect a trailing
slash to be present


reaction1989/roslyn,akrisiun/roslyn,akrisiun/roslyn,abock/roslyn,mattwar/roslyn,AdamSpeight2008/roslyn-AdamSpeight2008,AmadeusW/roslyn,mmitche/roslyn,mattscheffer/roslyn,CyrusNajmabadi/roslyn,mavasani/roslyn,davkean/roslyn,tmat/roslyn,AdamSpeight2008/roslyn-AdamSpeight2008,jamesqo/roslyn,TyOverby/roslyn,AlekseyTs/roslyn,stephentoub/roslyn,yeaicc/roslyn,dotnet/roslyn,davkean/roslyn,jasonmalinowski/roslyn,tvand7093/roslyn,tmeschter/roslyn,MattWindsor91/roslyn,mgoertz-msft/roslyn,jcouv/roslyn,davkean/roslyn,agocke/roslyn,eriawan/roslyn,OmarTawfik/roslyn,weltkante/roslyn,xasx/roslyn,cston/roslyn,abock/roslyn,zooba/roslyn,DustinCampbell/roslyn,orthoxerox/roslyn,tmeschter/roslyn,mattscheffer/roslyn,Hosch250/roslyn,heejaechang/roslyn,physhi/roslyn,jamesqo/roslyn,jeffanders/roslyn,tmat/roslyn,cston/roslyn,paulvanbrenk/roslyn,gafter/roslyn,KevinRansom/roslyn,zooba/roslyn,mavasani/roslyn,diryboy/roslyn,ErikSchierboom/roslyn,tannergooding/roslyn,srivatsn/roslyn,mattscheffer/roslyn,khyperia/roslyn,pdelvo/roslyn,AdamSpeight2008/roslyn-AdamSpeight2008,eriawan/roslyn,mgoertz-msft/roslyn,wvdd007/roslyn,DustinCampbell/roslyn,brettfo/roslyn,dotnet/roslyn,AlekseyTs/roslyn,sharwell/roslyn,mmitche/roslyn,amcasey/roslyn,agocke/roslyn,tmat/roslyn,pdelvo/roslyn,heejaechang/roslyn,gafter/roslyn,KevinRansom/roslyn,abock/roslyn,dpoeschl/roslyn,AmadeusW/roslyn,mmitche/roslyn,zooba/roslyn,drognanar/roslyn,tvand7093/roslyn,nguerrera/roslyn,KirillOsenkov/roslyn,AmadeusW/roslyn,jasonmalinowski/roslyn,dpoeschl/roslyn,tmeschter/roslyn,swaroop-sridhar/roslyn,weltkante/roslyn,akrisiun/roslyn,MichalStrehovsky/roslyn,shyamnamboodiripad/roslyn,OmarTawfik/roslyn,robinsedlaczek/roslyn,srivatsn/roslyn,jkotas/roslyn,KevinRansom/roslyn,bartdesmet/roslyn,weltkante/roslyn,gafter/roslyn,stephentoub/roslyn,sharwell/roslyn,kelltrick/roslyn,paulvanbrenk/roslyn,VSadov/roslyn,jeffanders/roslyn,jmarolf/roslyn,robinsedlaczek/roslyn,MattWindsor91/roslyn,jkotas/roslyn,panopticoncentral/roslyn,swaroop-sridhar/roslyn,brettfo/roslyn,MattWindsor91/roslyn,tannergooding/roslyn,KirillOsenkov/roslyn,genlu/roslyn,swaroop-sridhar/roslyn,mavasani/roslyn,mattwar/roslyn,xasx/roslyn,drognanar/roslyn,TyOverby/roslyn,orthoxerox/roslyn,shyamnamboodiripad/roslyn,wvdd007/roslyn,AnthonyDGreen/roslyn,amcasey/roslyn,VSadov/roslyn,OmarTawfik/roslyn,bkoelman/roslyn,jcouv/roslyn,CyrusNajmabadi/roslyn,CaptainHayashi/roslyn,reaction1989/roslyn,KirillOsenkov/roslyn,panopticoncentral/roslyn,CaptainHayashi/roslyn,CyrusNajmabadi/roslyn,orthoxerox/roslyn,MichalStrehovsky/roslyn,yeaicc/roslyn,lorcanmooney/roslyn,yeaicc/roslyn,CaptainHayashi/roslyn,panopticoncentral/roslyn,ErikSchierboom/roslyn,jmarolf/roslyn,Hosch250/roslyn,Giftednewt/roslyn,ErikSchierboom/roslyn,jamesqo/roslyn,lorcanmooney/roslyn,khyperia/roslyn,MattWindsor91/roslyn,jasonmalinowski/roslyn,jcouv/roslyn,nguerrera/roslyn,heejaechang/roslyn,AnthonyDGreen/roslyn,paulvanbrenk/roslyn,TyOverby/roslyn,physhi/roslyn,bartdesmet/roslyn,DustinCampbell/roslyn,eriawan/roslyn,tvand7093/roslyn,bartdesmet/roslyn,aelij/roslyn,robinsedlaczek/roslyn,agocke/roslyn,jkotas/roslyn,amcasey/roslyn,aelij/roslyn,stephentoub/roslyn,VSadov/roslyn,diryboy/roslyn,lorcanmooney/roslyn,xasx/roslyn,khyperia/roslyn,wvdd007/roslyn,diryboy/roslyn,kelltrick/roslyn,dotnet/roslyn,pdelvo/roslyn,reaction1989/roslyn,physhi/roslyn,bkoelman/roslyn,tannergooding/roslyn,AnthonyDGreen/roslyn,genlu/roslyn,jmarolf/roslyn,MichalStrehovsky/roslyn,aelij/roslyn,nguerrera/roslyn,drognanar/roslyn,Giftednewt/roslyn,shyamnamboodiripad/roslyn,AlekseyTs/roslyn,brettfo/roslyn,dpoeschl/roslyn,genlu/roslyn,cston/roslyn,jeffanders/roslyn,bkoelman/roslyn,mgoertz-msft/roslyn,kelltrick/roslyn,srivatsn/roslyn,mattwar/roslyn,Giftednewt/roslyn,sharwell/roslyn,Hosch250/roslyn