Core/Creatures: Implemented CREATURE_STATIC_FLAG_4_NO_MELEE_APPROACH and fixed CREATURE_STATIC_FLAG_NO_MELEE_FLEE implementation (should cause fleeing from melee range)

Port From (https://github.com/TrinityCore/TrinityCore/commit/a748fddfa47216e1f516303e3bca9b5a86823748)

Source/Game/AI/CoreAI/CreatureAI.cs

@@ -27,9 +27,9 @@ namespace Game.AI
         protected TaskScheduler _scheduler = new();
         protected InstanceScript _instanceScript;
 
-        public CreatureAI(Creature _creature) : base(_creature)
+        public CreatureAI(Creature creature) : base(creature)
         {
-            me = _creature;
+            me = creature;
             _moveInLOSLocked = false;
         }
 
@@ -514,6 +514,21 @@ namespace Game.AI
         // called when the corpse of this creature gets removed
         public virtual void CorpseRemoved(long respawnDelay) { }
 
+        public override void AttackStart(Unit victim)
+        {
+            if (victim != null && me.Attack(victim, true))
+            {
+                // Clear distracted state on attacking
+                if (me.HasUnitState(UnitState.Distracted))
+                {
+                    me.ClearUnitState(UnitState.Distracted);
+                    me.GetMotionMaster().Clear();
+                }
+
+                me.StartDefaultCombatMovement(victim);
+            }
+        }
+
         /// == Gossip system ================================
 
         // Called when the dialog status between a player and the creature is requested.