Core/Scripts: Fixed ENSURE_AI assertion failures when used in Reset()/InitializeAI() hooks with hotswap

Updates #20727

(cherry picked from commit 2fd9dc2edb0355d15f5afd21cc6aa61d172d19cc)

src/server/game/Scripting/ScriptMgr.cpp

@@ -453,7 +453,7 @@ class CreatureGameObjectAreaTriggerScriptRegistrySwapHooks
         if (creature->IsAlive())
             creature->ClearUnitState(UNIT_STATE_EVADE);
 
-        bool const created = creature->AIM_Initialize();
+        bool const created = creature->AIM_Create();
         ASSERT(created,
                "Creating the AI should never fail here!");
         (void)created;
@@ -464,6 +464,7 @@ class CreatureGameObjectAreaTriggerScriptRegistrySwapHooks
         if (!creature->IsAlive())
             return;
 
+        creature->AI_InitializeAndEnable();
         creature->AI()->EnterEvadeMode();
 
         // Cast a dummy visual spell asynchronously here to signal