Update Dev Home to use WindowsAppSDK 1.6

[krschau]

Besides the change in Dev Home, there are dependencies:

Tasks

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1. [Feature Request] Update CsWinRT for WinUI 3 renderer AdaptiveCards#9001
   Request +1
   
2. WinAppSDK upgrade time! (after .84 is verified stable) PowerToys#34622
   +0
3. Updated to WinAppSdk 1.6, fixed AoT annotations CommunityToolkit/Windows#457
   +0