Fix build for ARM

Author: jianghaolu

src/ResourceManager/Common/Commands.ScenarioTests.ResourceManager.Common/Mocks/MockClientFactory.cs

@@ -165,7 +165,7 @@ public void RemoveAction(Type actionType)
             // Do nothing
         }
 
-        public void AddHandler(DelegatingHandler handler)
+        public void AddHandler<T>(T handler) where T : DelegatingHandler, ICloneable
         {
             // Do nothing
         }