Core/Creatures: moved summon AI hooks to SummonInfo API

src/server/game/Entities/Unit/Unit.cpp

@@ -8863,9 +8863,6 @@ void Unit::UnregisterSummon(SummonInfo* summon)
     if (!summon)
         return;
 
-    // Perform cleanup actions if needed
-    summon->HandlePreUnsummonActions();
-
     SummonPropertiesSlot slot = summon->GetSummonSlot();
     if (slot == SummonPropertiesSlot::None)
     {