Change NuGet.Config to be independent from global NuGet.Config (#20168) (#20169)

* Clear all package source options
* Move Azure .NET 10 transport feed from RestoreAdditionalProjectSources to NuGet.Config

NuGet.Config

@@ -4,5 +4,18 @@
   <packageSources>
     <clear />
     <add key="api.nuget.org" value="https://api.nuget.org/v3/index.json" />
+    <add key="azure-dotnet10-transport" value="https://pkgs.dev.azure.com/dnceng/public/_packaging/dotnet10-transport/nuget/v3/index.json" />
   </packageSources>
+  <packageSourceMapping>
+    <clear />
+  </packageSourceMapping>
+  <auditSources>
+    <clear />
+  </auditSources>
+  <disabledPackageSources>
+    <clear />
+  </disabledPackageSources>
+  <fallbackPackageFolders>
+    <clear />
+  </fallbackPackageFolders>
 </configuration>

nukebuild/_build.csproj

@@ -9,8 +9,6 @@
     <TargetFramework>$(AvsCurrentTargetFramework)</TargetFramework>
     <!-- See https://github.com/nuke-build/nuke/issues/818 -->
     <EnableUnsafeBinaryFormatterSerialization>true</EnableUnsafeBinaryFormatterSerialization>
-    <!-- Necessary for Microsoft.DotNet.ApiDiff.Tool -->
-    <RestoreAdditionalProjectSources>https://pkgs.dev.azure.com/dnceng/public/_packaging/dotnet10-transport/nuget/v3/index.json</RestoreAdditionalProjectSources>
   </PropertyGroup>
 
   <Import Project="..\build\JetBrains.dotMemoryUnit.props" />