Remove 2.1 from vsconfig (#10005)

This isn't needed anymore

.vsconfig

@@ -8,8 +8,6 @@
     "Microsoft.VisualStudio.Component.Roslyn.Compiler",
     "Microsoft.VisualStudio.Component.Roslyn.LanguageServices",
     "Microsoft.VisualStudio.Component.FSharp",
-    "Microsoft.Net.Core.Component.SDK.2.1",
-    "Microsoft.NetCore.ComponentGroup.DevelopmentTools.2.1",
     "Microsoft.Net.Component.4.7.2.SDK",
     "Microsoft.Net.Component.4.7.2.TargetingPack",
     "Microsoft.Net.ComponentGroup.DevelopmentPrerequisites",