[PowerToys Run] Update to net5 (#12434)

* [Setup] Add support for installing both dotnet 3 and 5 (#12306)

* [PowerToys Run] Update to net5 (#12286)

* Change targets of projects

* Update Microsoft.Toolkit.Uwp.Notifications,

changed TargetFramework for PowerLauncher project in order to resolve an issue with ModernWpf

* Specify windows version in order to fix build errors

* Fixed suppressed warnings

* Updated sdk

* Removed usage of obsolete GlobalAssemblyCache

* Removed obsolete DesktopNotificationManagerCompat

* Update nuget versions

* Update installer

* [PowerToys Run] Obsolete APIs and warnings introduced in .net5 (#12423)

* Change targets of projects

* Update Microsoft.Toolkit.Uwp.Notifications,

changed TargetFramework for PowerLauncher project in order to resolve an issue with ModernWpf

* Fixed suppressed warnings

* Removed obsolete DesktopNotificationManagerCompat

* Get rid of binary formatter

* Update tests

* Don't include new image cache file to the report

* There's no need to call IsOwner as it doesn't make sense

* Fix different nullability exception

* Exclude extra dlls from tests

Co-authored-by: Andrey Nekrasov <yuyoyuppe@users.noreply.github.com>

src/modules/launcher/Plugins/Microsoft.PowerToys.Run.Plugin.System.UnitTests/Microsoft.PowerToys.Run.Plugin.System.UnitTests.csproj

@@ -1,7 +1,7 @@
 <Project Sdk="Microsoft.NET.Sdk">
 
   <PropertyGroup>
-    <TargetFramework>netcoreapp3.1</TargetFramework>
+    <TargetFramework>net5.0-windows</TargetFramework>
 
     <IsPackable>false</IsPackable>
 	<Platforms>x64</Platforms>