HHH-19912 Add automatic test data cleanup feature to @SessionFactory annotation

[inpink]

[Please describe here what your change is about]

• Added a dropTestData() attribute to @SessionFactory (default NEVER) so tests can opt into automatic cleanup declaratively.
• Introduced the DropDataTiming enum to capture supported cleanup moments (NEVER, BEFORE/AFTER_EACH, BEFORE/AFTER_ALL).
• Updated SessionFactoryExtension to store the configured timing and invoke scope.dropData() during the matching JUnit lifecycle callbacks (before/after each or all tests).
• Added DropDataTimingTest to prove each timing option behaves as expected by inserting data and asserting whether it persists or gets cleared at the right moments.
• Added SessionFactoryProducerDropDataTest to show that tests using only SessionFactoryProducer (no annotation) default to DropDataTiming.NEVER, keeping data until explicitly dropped.

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https://hibernate.atlassian.net/browse/HHH-19912

[sebersole]

I still wonder if we want to allow multiple options here (array attribute). Its hidden in the Jira a bit, but I mean specifically this thought -

DropDataTiming[] dropTestData() default {}

What do you think?

[inpink]

@sebersole Good idea! I think using BEFORE_EACH and AFTER_EACH together doesn't provide significant benefits. However, combining BEFORE_ALL or AFTER_ALL with other timing options would be quite effective. If you agree, I'll modify the implementation to support multiple timing values as an array.

If using an array, we would need to handle cases where NEVER is used together with other timings. How about throwing an exception like ValidationMode does?