Makes accept cloning message use Eui (#2910)

Content.Shared/GameObjects/Components/Observer/AcceptCloningEuiMessage.cs

@@ -0,0 +1,24 @@
+using System;
+using Content.Shared.Eui;
+using Robust.Shared.Serialization;
+
+namespace Content.Shared.GameObjects.Components.Observer
+{
+    [Serializable, NetSerializable]
+    public enum AcceptCloningUiButton
+    {
+        Deny,
+        Accept,
+    }
+
+    [Serializable, NetSerializable]
+    public class AcceptCloningChoiceMessage : EuiMessageBase
+    {
+        public readonly AcceptCloningUiButton Button;
+
+        public AcceptCloningChoiceMessage(AcceptCloningUiButton button)
+        {
+            Button = button;
+        }
+    }
+}