[BUG] Uno.WinUI windows target is broken

[anpin]

Description

Uno.WinUI target has some missing dependencies and nuget package 8.1.97 is not compatible with current version of Uno.WinUI targeting net6.0

Steps to Reproduce

1. clone master
2. build PrismLibrary_Uno.sln
3. It fails

Platform with bug

Uno Platform - WinUI

Affected platforms

Windows

Did you find any workaround?

I have changed conditionals in Prism.Uno.WinUI.csproj

Relevant log output

....

D:\Prism\src\Uno\Prism.Uno\Prism.Uno.WinUI.csproj]
D:\Prism\src\Wpf\Prism.Wpf\Regions\RegionManager.cs(188,47): error CS0246: The type or namespace name
'DependencyObject' could not be found (are you missing a using directive or an assembly reference?) [D:\blav-app\module
s\Prism\src\Uno\Prism.Uno\Prism.Uno.WinUI.csproj]
D:\Prism\src\Wpf\Prism.Wpf\Regions\RegionManager.cs(201,45): error CS0246: The type or namespace name
'DependencyObject' could not be found (are you missing a using directive or an assembly reference?) [D:\blav-app\module
s\Prism\src\Uno\Prism.Uno\Prism.Uno.WinUI.csproj]
D:\Prism\src\Wpf\Prism.Wpf\Regions\RegionManager.cs(242,44): error CS0246: The type or namespace name
'DependencyObject' could not be found (are you missing a using directive or an assembly reference?) [D:\blav-app\module
s\Prism\src\Uno\Prism.Uno\Prism.Uno.WinUI.csproj]
D:\Prism\src\Wpf\Prism.Wpf\Regions\RegionManager.cs(51,32): error CS0246: The type or namespace name '
DependencyProperty' could not be found (are you missing a using directive or an assembly reference?) [D:\blav-app\modul
es\Prism\src\Uno\Prism.Uno\Prism.Uno.WinUI.csproj]
D:\Prism\src\Wpf\Prism.Wpf\Regions\RegionManager.cs(84,33): error CS0246: The type or namespace name '
DependencyProperty' could not be found (are you missing a using directive or an assembly reference?) [D:\blav-app\modul
es\Prism\src\Uno\Prism.Uno\Prism.Uno.WinUI.csproj]
D:\Prism\src\Wpf\Prism.Wpf\Regions\RegionManager.cs(140,32): error CS0246: The type or namespace name
'DependencyProperty' could not be found (are you missing a using directive or an assembly reference?) [D:\blav-app\modu
les\Prism\src\Uno\Prism.Uno\Prism.Uno.WinUI.csproj]
D:\Prism\src\Wpf\Prism.Wpf\Regions\RegionManager.cs(172,32): error CS0246: The type or namespace name
'DependencyProperty' could not be found (are you missing a using directive or an assembly reference?) [D:\blav-app\modu
les\Prism\src\Uno\Prism.Uno\Prism.Uno.WinUI.csproj]
    7 Warning(s)
    141 Error(s)

[anpin]

Found this issue after I hit this https://github.com/unoplatform/uno/issues/9396

[dansiegel]

This should have been fixed by #2822