Made WinUI 2.x optional on uwp#60

Arlodotexe merged 2 commits into

mainCommunityToolkit/Tooling-Windows-Submodule:mainfrom

feature/multitarget/disable-winui-2.x-on-uwpCommunityToolkit/Tooling-Windows-Submodule:feature/multitarget/disable-winui-2.x-on-uwpCopy head branch name to clipboard