CmdPal: Ensure all assets WinGet extension are copied to the output (#41981)

## Summary of the Pull Request

This PR fixes missing icons in WinGet extension.

Updates `Microsoft.CmdPal.Ext.WinGet.csproj` to remove individual asset
entries and include all files in the `Assets` directory using a wildcard
pattern.

<!-- Please review the items on the PR checklist before submitting-->
## PR Checklist

- [x] Closes: #41980  
- [ ] **Communication:** I've discussed this with core contributors
already. If the work hasn't been agreed, this work might be rejected
- [ ] **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

<!-- Provide a more detailed description of the PR, other things fixed,
or any additional comments/features here -->
## Detailed Description of the Pull Request / Additional comments

<!-- Describe how you validated the behavior. Add automated tests
wherever possible, but list manual validation steps taken as well -->
## Validation Steps Performed

src/modules/cmdpal/ext/Microsoft.CmdPal.Ext.WinGet/Microsoft.CmdPal.Ext.WinGet.csproj

@@ -88,25 +88,11 @@
   </ItemGroup>
 
   <ItemGroup>
-    <Content Update="Assets\Extension.png">
-      <CopyToOutputDirectory>PreserveNewest</CopyToOutputDirectory>
-    </Content>
-    <Content Update="Assets\Extension.svg">
-      <CopyToOutputDirectory>PreserveNewest</CopyToOutputDirectory>
-    </Content>
-    <Content Update="Assets\Store.dark.png">
-      <CopyToOutputDirectory>PreserveNewest</CopyToOutputDirectory>
-    </Content>
-    <Content Update="Assets\Store.dark.svg">
-      <CopyToOutputDirectory>PreserveNewest</CopyToOutputDirectory>
-    </Content>
-    <Content Update="Assets\Store.light.png">
-      <CopyToOutputDirectory>PreserveNewest</CopyToOutputDirectory>
-    </Content>
-    <Content Update="Assets\Store.light.svg">
+    <Content Update="Assets\**\*.*">
       <CopyToOutputDirectory>PreserveNewest</CopyToOutputDirectory>
     </Content>
   </ItemGroup>
+
   <ItemGroup>
     <EmbeddedResource Update="Properties\Resources.resx">
       <LastGenOutput>Resources.Designer.cs</LastGenOutput>