Skip .editorconfig discovery test for now
Skip .editorconfig discovery test for now

Our CI machines don't have a new enough MSBuild to support this; adding
it is tracked by https://github.com/dotnet/core-eng/issues/6424 which
is currently underway but there's no reason to hold up the larger
work on the test.

genlu/roslyn,bartdesmet/roslyn,shyamnamboodiripad/roslyn,tmat/roslyn,dotnet/roslyn,sharwell/roslyn,diryboy/roslyn,jasonmalinowski/roslyn,ErikSchierboom/roslyn,eriawan/roslyn,shyamnamboodiripad/roslyn,mgoertz-msft/roslyn,mavasani/roslyn,gafter/roslyn,stephentoub/roslyn,eriawan/roslyn,aelij/roslyn,brettfo/roslyn,shyamnamboodiripad/roslyn,diryboy/roslyn,KevinRansom/roslyn,AlekseyTs/roslyn,KirillOsenkov/roslyn,heejaechang/roslyn,ErikSchierboom/roslyn,tannergooding/roslyn,KirillOsenkov/roslyn,tmat/roslyn,gafter/roslyn,genlu/roslyn,mavasani/roslyn,bartdesmet/roslyn,davkean/roslyn,panopticoncentral/roslyn,bartdesmet/roslyn,agocke/roslyn,tmat/roslyn,dotnet/roslyn,sharwell/roslyn,KevinRansom/roslyn,genlu/roslyn,eriawan/roslyn,AmadeusW/roslyn,stephentoub/roslyn,panopticoncentral/roslyn,nguerrera/roslyn,weltkante/roslyn,dotnet/roslyn,tannergooding/roslyn,agocke/roslyn,reaction1989/roslyn,AmadeusW/roslyn,wvdd007/roslyn,CyrusNajmabadi/roslyn,jmarolf/roslyn,sharwell/roslyn,physhi/roslyn,heejaechang/roslyn,jasonmalinowski/roslyn,physhi/roslyn,CyrusNajmabadi/roslyn,mgoertz-msft/roslyn,panopticoncentral/roslyn,davkean/roslyn,brettfo/roslyn,reaction1989/roslyn,ErikSchierboom/roslyn,wvdd007/roslyn,aelij/roslyn,AlekseyTs/roslyn,mgoertz-msft/roslyn,stephentoub/roslyn,heejaechang/roslyn,AmadeusW/roslyn,abock/roslyn,nguerrera/roslyn,gafter/roslyn,AlekseyTs/roslyn,KevinRansom/roslyn,jasonmalinowski/roslyn,agocke/roslyn,jmarolf/roslyn,abock/roslyn,wvdd007/roslyn,reaction1989/roslyn,nguerrera/roslyn,weltkante/roslyn,abock/roslyn,diryboy/roslyn,davkean/roslyn,CyrusNajmabadi/roslyn,aelij/roslyn,physhi/roslyn,weltkante/roslyn,mavasani/roslyn,jmarolf/roslyn,KirillOsenkov/roslyn,brettfo/roslyn,tannergooding/roslyn