Don't try to publish symbol package separately

Author: dsplaisted

eng/pipelines/templates/jobs/dnup/dnup-library-publish.yml

@@ -46,6 +46,6 @@ jobs:
               displayName: 🟣 Publish packages to AzDO
               inputs:
                 useDotNetTask: true
-                packagesToPush: $(System.DefaultWorkingDirectory)/artifacts/**/*.nupkg
+                packagesToPush: '!$(System.DefaultWorkingDirectory)/artifacts/**/*.symbols.nupkg;$(System.DefaultWorkingDirectory)/artifacts/**/*.nupkg'
                 packageParentPath: $(System.DefaultWorkingDirectory)/artifacts
                 publishVstsFeed: public/dotnet-tools