Remove prune package data for .NET Framework (#50816)

Author: dsplaisted

src/Tasks/Microsoft.NET.Build.Tasks/FrameworkPackages/FrameworkPackages.cs

@@ -27,7 +27,6 @@ static FrameworkPackages()
     {
         NETStandard20.Register();
         NETStandard21.Register();
-        NET461.Register();
         NETCoreApp20.Register();
         NETCoreApp21.Register();
         NETCoreApp22.Register();