Change how JPAConfig cleans up its resources

[marko-bekhta]

fixes #34547

As we discussed in the linked issue, the order in which beans are destroyed is not guaranteed. With this patch, JPAConfig will observe the shutdown event and clean up the resources then.
Since persistent units are now going to be closed prior to datasource being destroyed this should allow Hibernate Search to stop things cleanly.

For the observer priority I've initially used the ObserverMethod.DEFAULT_PRIORITY as the base value but then noticed that it uses the one from the jakarta.interceptor.Interceptor.Priority and thought that:

Start of range for late interceptors defined by extension libraries.

might be the one applicable here 😃

[quarkus-bot]

/cc @gsmet (hibernate-orm,hibernate-search), @yrodiere (hibernate-orm,hibernate-search)

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