fix TestDeeplyNestedTransactionWithBlockAndWrappedCallback test #43
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Old test (Postgres assumption):
Expected user2 to still be visible inside the parent transaction after its rollback.
This matches Postgres behavior: rolled-back rows can sometimes still be visible in the same transaction until the outer transaction ends.
New test (Oracle semantics):
Now expects user2 to disappear immediately after rolling back to the savepoint.
Oracle uses undo segments and ROLLBACK TO SAVEPOINT, which permanently discards changes from the inner transaction, so that even the parent can’t see them anymore.