[CmdPal][AOT] Fix fontIcon issue when build with AOT (#40058)

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fix/what does it change/how was it tested (even manually, if necessary)?
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## Summary of the Pull Request
FontIcon will be trimmed, we need to create a rd.xml to keep them.

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## PR Checklist

- [x] **Closes:** #40057
- [x] **Communication:** I've discussed this with core contributors
already. If the work hasn't been agreed, this work might be rejected
- [x] **Tests:** Added/updated and all pass
- [ ] **Localization:** All end-user-facing strings can be localized
- [ ] **Dev docs:** Added/updated
- [ ] **New binaries:** Added on the required places
- [ ] [JSON for
signing](https://github.com/microsoft/PowerToys/blob/main/.pipelines/ESRPSigning_core.json)
for new binaries
- [ ] [WXS for
installer](https://github.com/microsoft/PowerToys/blob/main/installer/PowerToysSetup/Product.wxs)
for new binaries and localization folder
- [ ] [YML for CI
pipeline](https://github.com/microsoft/PowerToys/blob/main/.pipelines/ci/templates/build-powertoys-steps.yml)
for new test projects
- [ ] [YML for signed
pipeline](https://github.com/microsoft/PowerToys/blob/main/.pipelines/release.yml)
- [ ] **Documentation updated:** If checked, please file a pull request
on [our docs
repo](https://github.com/MicrosoftDocs/windows-uwp/tree/docs/hub/powertoys)
and link it here: #xxx

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Co-authored-by: Yu Leng <yuleng@microsoft.com>

src/modules/cmdpal/Microsoft.CmdPal.UI/Microsoft.CmdPal.UI.csproj

@@ -105,6 +105,10 @@
     <ProjectCapability Include="Msix" />
   </ItemGroup>
 
+  <ItemGroup>
+	<RdXmlFile Include="rd.xml" />
+  </ItemGroup>
+
   <ItemGroup>
     <ProjectReference Include="..\..\..\common\ManagedTelemetry\Telemetry\ManagedTelemetry.csproj" />
     <ProjectReference Include="..\ext\Microsoft.CmdPal.Ext.System\Microsoft.CmdPal.Ext.System.csproj" />

src/modules/cmdpal/Microsoft.CmdPal.UI/rd.xml

@@ -0,0 +1,7 @@
+<Directives xmlns="http://schemas.microsoft.com/netfx/2013/01/metadata">
+	<Application>
+		<Assembly Name="Microsoft.WinUI">
+			<Type Name="Microsoft.UI.Xaml.Controls.FontIconSource" Dynamic="Required All" />
+		</Assembly>
+	</Application>
+</Directives>