Suppress IL2026 on Wasdk head, Add NoWarn.props import to App.Head.Uno.props and Head.WinAppSdk.props consistent with Uwp

Author: Arlodotexe

ProjectHeads/App.Head.Uno.props

@@ -6,6 +6,7 @@
   <Import Project="$(MSBuildThisFileDirectory)\App.Head.props" />
   <Import Project="$(MSBuildThisFileDirectory)\..\MultiTarget\PackageReferences\Uno.props" />
   <Import Project="$(MSBuildThisFileDirectory)\..\MultiTarget\WinUI.Extra.props" />
+  <Import Project="$(MSBuildThisFileDirectory)\..\MultiTarget\NoWarn.props" />
 
   <PropertyGroup Condition="'$(IsUno)' == 'true'">
     <!-- Code generated by Uno.UI.SourceGenerators creates AoT-unsafe code when Behaviors are used.  -->

ProjectHeads/Head.WinAppSdk.props

@@ -15,6 +15,12 @@
 
   <Import Project="$(MSBuildThisFileDirectory)\..\MultiTarget\PackageReferences\WinAppSdk.props" />
   <Import Project="$(MSBuildThisFileDirectory)\..\MultiTarget\WinUI.Extra.props" />
+  <Import Project="$(MSBuildThisFileDirectory)\..\MultiTarget\NoWarn.props" />
+
+  <PropertyGroup>
+    <!-- Platform-generated XAML creates AoT-unsafe code when Behaviors are used. -->
+    <NoWarn>$(NoWarn);IL2026</NoWarn>
+  </PropertyGroup>
 
   <PropertyGroup>
       <RuntimeIdentifier Condition="$([MSBuild]::GetTargetFrameworkVersion('$(TargetFramework)')) >= 8">win-$(Platform)</RuntimeIdentifier>