Add RespectRequiredConstructorParametersDefault feature switch to test project

Co-authored-by: javiercn <6995051+javiercn@users.noreply.github.com>

Author: Copilot

src/Components/test/testassets/BasicTestApp/BasicTestApp.csproj

@@ -16,6 +16,11 @@
 
   </PropertyGroup>
 
+  <ItemGroup>
+    <!-- Enable RespectRequiredConstructorParametersDefault to test compatibility -->
+    <RuntimeHostConfigurationOption Include="System.Text.Json.Serialization.RespectRequiredConstructorParametersDefault" Value="true" />
+  </ItemGroup>
+
   <PropertyGroup Condition="'$(TestTrimmedOrMultithreadingApps)' == 'true'">
     <!-- Avoid spending time brotli compression publish output.-->
     <_BlazorBrotliCompressionLevel>NoCompression</_BlazorBrotliCompressionLevel>