Only run windows_loc_status in PR builds
Only run windows_loc_status in PR builds

For the moment we only want to run windows_loc_status in PR builds, on
demand. Later we'll update the condition to run it automatically in
release branches (based on the name) for both CI and PR builds.

VSadov/roslyn,OmarTawfik/roslyn,heejaechang/roslyn,MichalStrehovsky/roslyn,tannergooding/roslyn,CyrusNajmabadi/roslyn,eriawan/roslyn,mavasani/roslyn,MichalStrehovsky/roslyn,jasonmalinowski/roslyn,reaction1989/roslyn,tmat/roslyn,weltkante/roslyn,tmeschter/roslyn,OmarTawfik/roslyn,aelij/roslyn,eriawan/roslyn,mavasani/roslyn,davkean/roslyn,jmarolf/roslyn,genlu/roslyn,sharwell/roslyn,diryboy/roslyn,xasx/roslyn,abock/roslyn,VSadov/roslyn,OmarTawfik/roslyn,jamesqo/roslyn,AlekseyTs/roslyn,paulvanbrenk/roslyn,xasx/roslyn,cston/roslyn,KirillOsenkov/roslyn,KirillOsenkov/roslyn,diryboy/roslyn,tannergooding/roslyn,CyrusNajmabadi/roslyn,jcouv/roslyn,tmat/roslyn,agocke/roslyn,stephentoub/roslyn,cston/roslyn,brettfo/roslyn,KevinRansom/roslyn,dotnet/roslyn,mgoertz-msft/roslyn,tmeschter/roslyn,AdamSpeight2008/roslyn-AdamSpeight2008,nguerrera/roslyn,jasonmalinowski/roslyn,xasx/roslyn,nguerrera/roslyn,physhi/roslyn,reaction1989/roslyn,genlu/roslyn,gafter/roslyn,panopticoncentral/roslyn,agocke/roslyn,aelij/roslyn,panopticoncentral/roslyn,bartdesmet/roslyn,AlekseyTs/roslyn,DustinCampbell/roslyn,jcouv/roslyn,brettfo/roslyn,weltkante/roslyn,shyamnamboodiripad/roslyn,shyamnamboodiripad/roslyn,VSadov/roslyn,paulvanbrenk/roslyn,wvdd007/roslyn,bkoelman/roslyn,KirillOsenkov/roslyn,abock/roslyn,AdamSpeight2008/roslyn-AdamSpeight2008,nguerrera/roslyn,AlekseyTs/roslyn,mavasani/roslyn,AmadeusW/roslyn,stephentoub/roslyn,swaroop-sridhar/roslyn,mgoertz-msft/roslyn,DustinCampbell/roslyn,swaroop-sridhar/roslyn,jasonmalinowski/roslyn,sharwell/roslyn,bartdesmet/roslyn,davkean/roslyn,abock/roslyn,dpoeschl/roslyn,DustinCampbell/roslyn,genlu/roslyn,KevinRansom/roslyn,tmat/roslyn,weltkante/roslyn,AmadeusW/roslyn,dotnet/roslyn,mgoertz-msft/roslyn,heejaechang/roslyn,CyrusNajmabadi/roslyn,dpoeschl/roslyn,bkoelman/roslyn,physhi/roslyn,MichalStrehovsky/roslyn,sharwell/roslyn,jmarolf/roslyn,shyamnamboodiripad/roslyn,ErikSchierboom/roslyn,cston/roslyn,bartdesmet/roslyn,gafter/roslyn,dpoeschl/roslyn,bkoelman/roslyn,panopticoncentral/roslyn,ErikSchierboom/roslyn,tannergooding/roslyn,physhi/roslyn,tmeschter/roslyn,aelij/roslyn,jmarolf/roslyn,jamesqo/roslyn,ErikSchierboom/roslyn,dotnet/roslyn,AdamSpeight2008/roslyn-AdamSpeight2008,jamesqo/roslyn,diryboy/roslyn,AmadeusW/roslyn,brettfo/roslyn,gafter/roslyn,swaroop-sridhar/roslyn,eriawan/roslyn,heejaechang/roslyn,agocke/roslyn,wvdd007/roslyn,KevinRansom/roslyn,jcouv/roslyn,stephentoub/roslyn,paulvanbrenk/roslyn,reaction1989/roslyn,davkean/roslyn,wvdd007/roslyn