Include MSBuild.Sdk.Extras/3.0.23 on UWP only

Author: Arlodotexe

components/ColorPicker/samples/ColorPicker.Samples.csproj

@@ -1,4 +1,5 @@
-<Project Sdk="MSBuild.Sdk.Extras/3.0.23">
+<Project>
+  <Import Project="$([MSBuild]::GetPathOfFileAbove(Directory.Build.props))" Condition="Exists('$([MSBuild]::GetPathOfFileAbove(Directory.Build.props))')" />
   <PropertyGroup>
     <ToolkitComponentName>ColorPicker</ToolkitComponentName>
   </PropertyGroup>

components/ColorPicker/src/CommunityToolkit.WinUI.Controls.ColorPicker.csproj

@@ -1,4 +1,5 @@
-<Project Sdk="MSBuild.Sdk.Extras/3.0.23">
+<Project>
+  <Import Project="$([MSBuild]::GetPathOfFileAbove(Directory.Build.props))" Condition="Exists('$([MSBuild]::GetPathOfFileAbove(Directory.Build.props))')" />
   <PropertyGroup>
     <ToolkitComponentName>ColorPicker</ToolkitComponentName>
     <Description>This package contains ColorPicker.</Description>