Not sure why icon isn't showing up in NuGet metadata, maybe casing as all examples show lowercase?

Also, add PackageIconUrl back as acceptable to have both for backwards compat

Author: michael-hawker

Directory.Build.targets

@@ -12,7 +12,7 @@
   </PropertyGroup>
 
   <ItemGroup Condition="$(IsPackable)">
-    <None Include="$(RepositoryDirectory)Icon.png" Pack="true" PackagePath="\" />
+    <None Include="$(RepositoryDirectory)icon.png" Pack="true" PackagePath="\" />
     <None Include="$(RepositoryDirectory)License.md" Pack="true" PackagePath="\" />
     <!--<None Include="$(RepositoryDirectory)ThirdPartyNotices.txt" Pack="true" PackagePath="\" />-->
   </ItemGroup>

Windows.Toolkit.Common.props

@@ -9,7 +9,8 @@
     <Copyright>(c) .NET Foundation and Contributors.  All rights reserved.</Copyright>
     <PackageProjectUrl>https://github.com/CommunityToolkit/Windows</PackageProjectUrl>
     <PackageReleaseNotes>https://github.com/CommunityToolkit/Windows/releases</PackageReleaseNotes>
-    <PackageIcon>Icon.png</PackageIcon>
+    <PackageIcon>icon.png</PackageIcon>
+    <PackageIconUrl>https://github.com/CommunityToolkit/Windows/blob/main/icon.png</PackageIconUrl>
     <!-- TODO: Remove when closing https://github.com/CommunityToolkit/Labs-Windows/issues/256 -->
     <NoWarn>$(NoWarn);NU1505;NU1504</NoWarn>
   </PropertyGroup>