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/Controls/CachedImage.cs

@@ -0,0 +1,37 @@
+namespace Bit.App.Controls
+{
+#if !UT
+    public class CachedImage : FFImageLoading.Maui.CachedImage
+    {
+    }
+#else
+    /// <summary>
+    /// Given that FFImageLoading package doesn't support net8.0 then for Unit tests projects to build and run correctly
+    /// we need to not include the reference to FFImageLoading and therefore wrap this class
+    /// to provide a stub one that does nothing so this project doesn't break and we can run the tests.
+    /// </summary>
+    public class CachedImage : View
+    {
+        public static readonly BindableProperty SourceProperty = BindableProperty.Create(
+            nameof(Source), typeof(ImageSource), typeof(CachedImage));
+
+        public static readonly BindableProperty AspectProperty = BindableProperty.Create(
+            nameof(Aspect), typeof(Aspect), typeof(CachedImage));
+
+        public bool BitmapOptimizations { get; set; }
+        public string ErrorPlaceholder { get; set; }
+        public string LoadingPlaceholder { get; set; }
+
+        public ImageSource Source
+        {
+            get { return (ImageSource)GetValue(SourceProperty); }
+            set { SetValue(SourceProperty, value); }
+        }
+        public Aspect Aspect
+        {
+            get { return (Aspect)GetValue(AspectProperty); }
+            set { SetValue(AspectProperty, value); }
+        }
+    }
+#endif
+}