Updating nuget.config with new endpoint

Author: shweaver-MSFT

nuget.config

@@ -3,7 +3,8 @@
   <packageSources>
     <clear />
     <add key="nuget.org" value="https://api.nuget.org/v3/index.json" protocolVersion="3" />
-    <add key="AzureLatest" value="https://pkgs.dev.azure.com/dotnet/CommunityToolkit/_packaging/WindowsCommunityToolkit-MainLatest/nuget/v3/index.json" protocolVersion="3" />
+    <add key="WCT Latest" value="https://pkgs.dev.azure.com/dotnet/CommunityToolkit/_packaging/CommunityToolkit-MainLatest/nuget/v3/index.json" protocolVersion="3" />
+    <add key="WCT PRs" value="https://pkgs.dev.azure.com/dotnet/CommunityToolkit/_packaging/CommunityToolkit-PullRequests/nuget/v3/index.json" protocolVersion="3" />
   </packageSources>
   <disabledPackageSources>
     <clear />