Core/AI: Make critters flee as soon as engaged in combat and make them evade after they stop running in fear

Port From (https://github.com/TrinityCore/TrinityCore/commit/934c320d4b0da40691be7449f860447fe79b4083)

Source/Game/Movement/Generators/MovementGenerators.cs

@@ -16,6 +16,7 @@
  */
 
 using Framework.Constants;
+using Game.AI;
 using Game.Entities;
 using System;
 
@@ -60,6 +61,12 @@ namespace Game.Movement
             return false;
         }
 
+        public void NotifyAIOnFinalize(Unit obj)
+        {
+            UnitAI ai = obj.GetAI();
+            ai?.OnMovementGeneratorFinalized(GetMovementGeneratorType());
+        }
+
         public void AddFlag(MovementGeneratorFlags flag) { Flags |= flag; }
         public bool HasFlag(MovementGeneratorFlags flag) { return (Flags & flag) != 0; }
         public void RemoveFlag(MovementGeneratorFlags flag) { Flags &= ~flag; }