[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>

.pipelines/ci/templates/build-powertoys-steps.yml

@@ -129,7 +129,8 @@ steps:
       **\UnitTest-ColorPickerUI.dll
       **\Microsoft.Interop.Tests.dll
       !**\obj\**
-
+      !**\ref\**
+      
 - task: VSTest@2
   displayName: 'XUnit Tests'
   inputs:
@@ -139,6 +140,7 @@ steps:
     testAssemblyVer2: |
       **\ImageResizer.Test.dll
       !**\obj\**
+      !**\ref\**
 
 - task: VSTest@2
   displayName: 'NUnit Tests'
@@ -155,6 +157,7 @@ steps:
       **\Wox.Test.dll
       **\Microsoft.PowerToys.Run.Plugin.System.UnitTests.dll
       !**\obj\**
+      !**\ref\**
 
 # Native dlls
 - task: VSTest@2