Provide AOT support for `@Nested` classes in a `@ParameterizedClass`
Overview
While checking the status of our AOT testing support for 7.0, I noticed that our AOT test class scanning support does not find @Nested test classes within a @ParameterizedClass.
The reason is that a JUnit Platform TestPlan does not contain entries for anything below a @ParameterizedClass. Instead, the TestClassScanner in spring-test only sees a ClassTemplateTestDescriptor for the @ParameterizedClass, and no NestedClassTestDescriptor is present in the TestPlan.
Thus, we will have to use a bit of "informed reflection techniques" to attempt to determine the presence of @Nested test classes within a @ParameterizedClass in order to perform AOT processing for their test application contexts.
In light of that, this feature is scheduled for inclusion in Spring Framework 7.0 as an enhancement.