HHH-14839 allow lazy association properties of detached entities after being persisted or merged to be fully traversed after a flush

[busitech]

…r being persisted or merged to be fully traversed after a flush. hibernate search 6 requires this to update indexes.

https://hibernate.atlassian.net/browse/HHH-14839

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[busitech]

This is our PR for Hibernate 6. https://github.com/hibernate/hibernate-orm/pull/4342