Core/Unit: cleanup UnitState enum

Port From (https://github.com/TrinityCore/TrinityCore/commit/1f0dc07ef183eefab5ad2c4a4f857d5184f5ad6f)

Source/Game/Entities/Creature/Creature.cs

@@ -1570,7 +1570,7 @@ namespace Game.Entities
                 SetCannotReachTarget(false);
                 UpdateMovementFlags();
 
-                ClearUnitState(UnitState.AllState & ~UnitState.IgnorePathfinding);
+                ClearUnitState(UnitState.AllErasable);
 
                 if (!IsPet())
                 {

Source/Game/Movement/Generators/HomeMovement.cs

@@ -71,7 +71,7 @@ namespace Game.AI
             skipToHome = false;
             arrived = false;
 
-            owner.ClearUnitState(UnitState.AllState & ~(UnitState.Evade | UnitState.IgnorePathfinding));
+            owner.ClearUnitState(UnitState.AllErasable & ~UnitState.Evade);
         }
 
         public override MovementGeneratorType GetMovementGeneratorType()

Source/Game/Spells/SpellEffects.cs

@@ -4383,7 +4383,7 @@ namespace Game.Spells
             pet.SetDynamicFlags(UnitDynFlags.HideModel);
             pet.RemoveUnitFlag(UnitFlags.Skinnable);
             pet.SetDeathState(DeathState.Alive);
-            pet.ClearUnitState(UnitState.AllState);
+            pet.ClearUnitState(UnitState.AllErasable);
             pet.SetHealth(pet.CountPctFromMaxHealth(damage));
 
             pet.InitializeAI();