PM-3350 PM-3349 Updated Unit Test projects to NET 8.0 and fixed it to work with Core project reference. Also fixed a test that was breaking due to CIpherKey creation being wrong. Added "UT" as a constant to add when building/running Core.Test project so we have something on the context that tells us that is for a UT. With this I had to remove FFImageLoading on UT context because it doesn't support NET 8.0

src/Core/MauiProgram.cs

@@ -1,6 +1,8 @@
 using Camera.MAUI;
 using CommunityToolkit.Maui;
+#if !UT
 using FFImageLoading.Maui;
+#endif
 using Microsoft.Extensions.Logging;
 using Microsoft.Maui.Controls.Compatibility.Hosting;
 using Microsoft.Maui.Handlers;
@@ -23,7 +25,9 @@ public static class MauiProgram
             .UseMauiCompatibility()
             .UseMauiCameraView()
             .UseSkiaSharp()
+#if !UT
             .UseFFImageLoading()
+#endif
             .ConfigureEffects(effects =>
             {
 #if ANDROID