Fix NetRuntimeBlobVersion (#44281)

Author: mthalman

src/Installer/redist-installer/targets/GenerateLayout.targets

@@ -11,8 +11,7 @@
     <!-- In unified build, the layout does match, so use the runtime package versions rather than the VS redist versions -->
     <AspNetCoreBlobVersion>$(MicrosoftAspNetCoreAppRefInternalPackageVersion)</AspNetCoreBlobVersion>
 
-    <NetRuntimeBlobVersion>$(VSRedistCommonNetCoreSharedFrameworkx6490PackageVersion)</NetRuntimeBlobVersion>
-    <NetRuntimeBlobVersion Condition=" '$(DotNetBuildOrchestrator)' == 'true' ">$(MicrosoftNETCoreAppRuntimePackageVersion)</NetRuntimeBlobVersion>
+    <NetRuntimeBlobVersion>$(MicrosoftNETCorePlatformsPackageVersion)</NetRuntimeBlobVersion>
 
     <WindowsDesktopBlobVersion>$(VSRedistCommonWindowsDesktopSharedFrameworkx6490PackageVersion)</WindowsDesktopBlobVersion>
     <WindowsDesktopBlobVersion Condition=" '$(DotNetBuildOrchestrator)' == 'true' ">$(MicrosoftWindowsDesktopAppRuntimePackageVersion)</WindowsDesktopBlobVersion>

src/SourceBuild/content/test/Microsoft.DotNet.SourceBuild.SmokeTests/assets/online.NuGet.Config

@@ -5,5 +5,6 @@
     <add key="dotnet9" value="https://pkgs.dev.azure.com/dnceng/public/_packaging/dotnet9/nuget/v3/index.json" />
     <add key="dotnet9-transport" value="https://pkgs.dev.azure.com/dnceng/public/_packaging/dotnet9-transport/nuget/v3/index.json" />
     <add key="darc-pub-dotnet-aspnetcore-3cc83de" value="https://pkgs.dev.azure.com/dnceng/public/_packaging/darc-pub-dotnet-aspnetcore-3cc83de3/nuget/v3/index.json" />
+    <add key="darc-pub-dotnet-runtime-d398172" value="https://pkgs.dev.azure.com/dnceng/public/_packaging/darc-pub-dotnet-runtime-d3981726/nuget/v3/index.json" />
   </packageSources>
 </configuration>