Remove Azure SDK feed from nuget.config (#3327)

NuGet.config

@@ -19,17 +19,11 @@
     <add key="dotnet-libraries" value="https://pkgs.dev.azure.com/dnceng/public/_packaging/dotnet-libraries/nuget/v3/index.json" />
     <add key="orleans-nightly" value="https://orleans.pkgs.visualstudio.com/orleans-public/_packaging/orleans-nightly/nuget/v3/index.json" />
     <add key="dotnet9-transport" value="https://dnceng.pkgs.visualstudio.com/public/_packaging/dotnet9-transport/nuget/v3/index.json" />
-    <add key="azure-sdk-for-net-dev" value="https://pkgs.dev.azure.com/azure-sdk/public/_packaging/azure-sdk-for-net/nuget/v3/index.json" />
   </packageSources>
   <packageSourceMapping>
     <packageSource key="dotnet9-transport">
       <package pattern="*WorkloadBuildTasks*" />
     </packageSource>
-    <packageSource key="azure-sdk-for-net-dev">
-      <package pattern="Azure.Provisioning" />
-      <package pattern="Azure.ResourceManager" />
-      <package pattern="Azure.ResourceManager.*" />
-    </packageSource>
     <packageSource key="dotnet-public">
       <package pattern="*" />
     </packageSource>