Request revive method `hasNonReadOnlyEntities`

[nomoreFt]

Hi,

I'm a regular user of Hibernate and have been using it extensively. Recently, I've been studying the internal workings of the @Transactional annotation, particularly the difference in behavior when readOnly is set to true and false.

During my debugging process, I noticed that the hasNonReadOnlyEntities method in the PersistenceContext class has been commented out by Gavin King. However, the variable it refers to still exists, and I believe it would be beneficial to either uncomment this method or provide an alternative getter method.

In this commit, I have simply uncommented the hasNonReadOnlyEntities method in the interface. This change would greatly aid in understanding and working with the read-only behavior of transactions in Hibernate.

Thank you for your consideration.

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