Prior to this commit, @BeforeTransaction and @AfterTransaction could
only be declared on methods within test classes. However, JUnit 5 as
well as some existing third-party Runner implementations for JUnit 4
already support Java 8 based interface default methods in various
scenarios -- for example, @Test, @BeforeEach, etc.
This commit brings the Spring TestContext Framework up to date by
supporting the declaration of @BeforeTransaction and @AfterTransaction
on interface default methods.
Issue: SPR-14183
0f6711fe3b