I was running into a couple of issues when building `msi.csproj` files
generated by the `GenerateVisualStudioWorkload` task:

    C:\Program Files\dotnet\sdk\5.0.301\Sdks\NuGet.Build.Tasks.Pack\build\NuGet.Build.Tasks.Pack.targets(221,5): error : Could not find a part of the path 'C:\Users\peter\source\yaml-templates\nuget-msi-convert\msbuild\obj\Debug\src\msiPackage\x86\Microsoft.Android.Sdk.Windows\obj\Debug\src\msiPackage\x86\Microsoft.Android.Sdk.Windows'.

    C:\Program Files\dotnet\sdk\5.0.301\Sdks\NuGet.Build.Tasks.Pack\build\NuGet.Build.Tasks.Pack.targets(221,5): error NU5046: The icon file 'Icon.png' does not exist in the package.

The first error was a result of the following relative path being
included in the `LICENSE.TXT` item:

    <None Include="obj\Debug\src\msiPackage\x86\Microsoft.Android.Sdk.Windows\LICENSE.TXT" Pack="true" PackagePath="\" />

Since `LICENSE.TXT` is created in the same directory as `msi.proj`, we
can exclude this relative path.

The second error appears to be a result of a missing `Icon.png` item,
which has been added.

The generated pack item content should now look like this:

    <ItemGroup>
      <None Include="C:\Users\peter\source\yaml-templates\nuget-msi-convert\msbuild\bin\Microsoft.Android.Sdk.Windows.30.0.100-ci.main.61-x86.msi" Pack="true" PackagePath="\data" />
      <None Include="C:\Users\peter\source\yaml-templates\nuget-msi-convert\msbuild\bin\Microsoft.Android.Sdk.Windows.30.0.100-ci.main.61-x86.json" Pack="true" PackagePath="\data\msi.json" />
      <None Include="Icon.png" Pack="true" PackagePath="" />
      <None Include="LICENSE.TXT" Pack="true" PackagePath="\" />
    </ItemGroup>