Condition NuGet pack in Microsoft.Net.Sdk on framework only (#50902)

Author: zivkan

src/Tasks/Microsoft.NET.Build.Tasks/Microsoft.NET.Build.Tasks.csproj

@@ -55,8 +55,9 @@
     <PackageReference Include="Microsoft.Build.Utilities.Core" ExcludeAssets="Runtime" />
     <PackageReference Include="Microsoft.Extensions.DependencyModel" />
     <PackageReference Include="Microsoft.NET.HostModel" />
-    <PackageReference Include="NuGet.Commands" />
-    <PackageReference Include="NuGet.Build.Tasks.Pack" />
+    <PackageReference Include="NuGet.ProjectModel" />
+    <PackageReference Include="NuGet.Commands" Condition="'$(TargetFrameworkIdentifier)' == '.NETFramework'" />
+    <PackageReference Include="NuGet.Build.Tasks.Pack" Condition="'$(TargetFrameworkIdentifier)' == '.NETFramework'" />
     <PackageReference Include="Microsoft.Deployment.DotNet.Releases" />
     <!-- Use an alias for APICompat so that we bring in the binaries, but don't accidentally reference any types -->
     <ProjectReference Include="$(RepoRoot)src\Compatibility\ApiCompat\Microsoft.DotNet.ApiCompat.Task\Microsoft.DotNet.ApiCompat.Task.csproj" Aliases="unused" PrivateAssets="All" />