fix: AvaloniaVS Intellisense (#14397)

* fix: AvaloniaVS Intellisense

* fix: Address review

packages/Avalonia/AvaloniaBuildTasks.targets

@@ -242,4 +242,21 @@
     <Delete Files="$(TargetRefPath)" Condition="Exists('$(TargetRefPath)')" />
   </Target>
 
+  <!--
+  $(IntermediateOutputPath)/Avalonia/references is using from AvaloniaVS for retrieve library references.
+  This target generate $(IntermediateOutputPath)/Avalonia/references for in xplat Template
+  (see: https://github.com/AvaloniaUI/avalonia-dotnet-templates/tree/e4a489ae828f005f625145c563785174403e267c/templates/csharp/xplat).
+  -->
+  <Target Name="GenerateIntellisenseReferences"
+          AfterTargets="AfterCompile"
+          Condition="('@(AvaloniaResource->Count())' == 0) and ('@(AvaloniaXaml->Count())' == 0)">
+    <PropertyGroup>
+      <AvaloniaXamlReferencesTemporaryFilePath Condition="'$(AvaloniaXamlReferencesTemporaryFilePath)' == ''">$(IntermediateOutputPath)/Avalonia/references</AvaloniaXamlReferencesTemporaryFilePath>
+    </PropertyGroup>
+    <WriteLinesToFile
+      Condition="'$(_AvaloniaForceInternalMSBuild)' != 'true'"
+      File="$(AvaloniaXamlReferencesTemporaryFilePath)"
+      Lines="@(ReferencePathWithRefAssemblies)"
+      Overwrite="true" />
+  </Target>
 </Project>