Remove internal feeds

Author: dougbu

NuGet.config

@@ -7,13 +7,6 @@
     <add key="darc-pub-dotnet-corefx-8a3ffed" value="https://pkgs.dev.azure.com/dnceng/public/_packaging/darc-pub-dotnet-corefx-8a3ffed5/nuget/v3/index.json" />
     <add key="darc-pub-dotnet-corefx-66409e3" value="https://pkgs.dev.azure.com/dnceng/public/_packaging/darc-pub-dotnet-corefx-66409e39/nuget/v3/index.json" />
     <add key="darc-pub-dotnet-blazor-cc44960" value="https://pkgs.dev.azure.com/dnceng/public/_packaging/darc-pub-dotnet-blazor-cc449601/nuget/v3/index.json" />
-    <add key="darc-int-dotnet-extensions-784b0ff" value="https://pkgs.dev.azure.com/dnceng/_packaging/darc-int-dotnet-extensions-784b0ffa/nuget/v3/index.json" />
-    <add key="darc-int-dotnet-efcore-cad165e" value="https://pkgs.dev.azure.com/dnceng/_packaging/darc-int-dotnet-efcore-cad165e7/nuget/v3/index.json" />
-    <add key="darc-int-dotnet-core-setup-fcfdef8-1" value="https://pkgs.dev.azure.com/dnceng/_packaging/darc-int-dotnet-core-setup-fcfdef8d-1/nuget/v3/index.json" />
-    <add key="darc-int-dotnet-core-setup-fcfdef8" value="https://pkgs.dev.azure.com/dnceng/_packaging/darc-int-dotnet-core-setup-fcfdef8d/nuget/v3/index.json" />
-    <add key="darc-int-dotnet-corefx-36b8b8e" value="https://pkgs.dev.azure.com/dnceng/_packaging/darc-int-dotnet-corefx-36b8b8e2/nuget/v3/index.json" />
-    <add key="darc-int-dotnet-corefx-059a4a1" value="https://pkgs.dev.azure.com/dnceng/_packaging/darc-int-dotnet-corefx-059a4a19/nuget/v3/index.json" />
-    <add key="darc-int-dotnet-aspnetcore-tooling-1c22292" value="https://pkgs.dev.azure.com/dnceng/_packaging/darc-int-dotnet-aspnetcore-tooling-1c22292b/nuget/v3/index.json" />
     <!--End: Package sources managed by Dependency Flow automation. Do not edit the sources above.-->
     <add key="dotnet-core" value="https://dotnetfeed.blob.core.windows.net/dotnet-core/index.json" />
     <add key="dotnet-eng" value="https://pkgs.dev.azure.com/dnceng/public/_packaging/dotnet-eng/nuget/v3/index.json" />