HHH-18151 Fix lazy loading with generics and inheritance

[mapuci]

https://hibernate.atlassian.net/jira/software/c/projects/HHH/issues/HHH-18151

My first PR. :)

The issue turned to be quite similar to https://hibernate.atlassian.net/jira/software/c/projects/HHH/issues/HHH-16459 with fix https://github.com/hibernate/hibernate-orm/pull/6404

The problem was that the method $$_$$_hibernate_read_GENERIC_ATTRIBUTE that was defined in concrete class did not override the same method in its MappedSuperclass. Because method signature (return type) was different.

[mapuci]

cc @yrodiere

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