Core/Creature: rename CREATURE_FLAG_EXTRA_IGNORE_COMBAT into CREATURE_FLAG_EXTRA_CANNOT_ENTER_COMBAT

Port From (https://github.com/TrinityCore/TrinityCore/commit/53d19b09f4de7c092747663ae7e1a01c0df553bf)

Source/Game/Entities/Unit/Unit.Combat.cs

@@ -1530,13 +1530,13 @@ namespace Game.Entities
         }
 
         /// <summary>
-        /// returns if the unit is ignoring any combat interaction
+        /// returns if the unit can't enter combat
         /// </summary>
-        public bool IsIgnoringCombat() { return _isIgnoringCombat; }
+        public bool IsCombatDisallowed() { return _isCombatDisallowed; }
 
         /// <summary>
-        /// enables/disables combat interaction of this unit.
+        /// enables / disables combat interaction of this unit
         /// </summary>
-        public void SetIgnoringCombat(bool apply) { _isIgnoringCombat = apply; }
+        public void SetIsCombatDisallowed(bool apply) { _isCombatDisallowed = apply; }
     }
 }