HHH-18598 Determine uniqueness from JoinColumn for inverseJoinColumns

[ememisya]

https://hibernate.atlassian.net/browse/HHH-18598

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[beikov]

Closing, since the Jira was rejected. A one-to-many with a join table needs a unique constraint on the FK columns in the join table to ensure semantics of the one-to-many association. If you want many-to-many semantics, use a @ManyToMany