specify the behavior of duplicate entity listeners

What is the order that entity listeners are invoked in that the Persistence specification should require?

See comments under [persistence/pull/1014](https://github.com/jakartaee/persistence/pull/1014/changes#r3132050241) for background.

Start with the linked persistence/pull/1014 discussion, which provides the background for duplicate entity listener behavior. Determine the invocation-order question the Persistence specification must resolve, then update the relevant specification text once the required behavior is established. Done means the specification clearly states the required ordering.

Written by the indexing model from the issue text.