Component minecraft:behavior.mingle does not support entity types in a list

The mingle_partner_type property in minecraft:behavior.mingle does not accept entity types in a list. It only allows a string, which means only a single entity type can mingle.

Steps to Reproduce:

1. Define an entity behavior using minecraft:behavior.mingle.

2. Set mingle_partner_type to a list, eg: "mingle_partner_type": ["minecraft:villager_v2"].

3. Observe that the entity does not accept the entities defined in the list and that the villagers are not mingling.