Core/Spell: register items received through SPELL_EFFECT_SUMMON_CHANGE_ITEM for quest credit

- Also sends proper SMSG_ITEM_PUSH_RESULT packet

Closes #3505

src/server/game/Spells/SpellEffects.cpp

@@ -1937,6 +1937,8 @@ void Spell::EffectSummonChangeItem(SpellEffIndex effIndex)
             m_castItemEntry = 0;
 
             player->StoreItem(dest, pNewItem, true);
+            player->SendNewItem(pNewItem, 1, true, false);
+            player->ItemAddedQuestCheck(newitemid, 1);
             return;
         }
     }
@@ -1981,6 +1983,8 @@ void Spell::EffectSummonChangeItem(SpellEffIndex effIndex)
 
             player->EquipItem(dest, pNewItem, true);
             player->AutoUnequipOffhandIfNeed();
+            player->SendNewItem(pNewItem, 1, true, false);
+            player->ItemAddedQuestCheck(newitemid, 1);
             return;
         }
     }