This commit introduces TestContextRuntimeHints which is a
RuntimeHintsRegistrar implementation that makes core types and
annotations from the Spring TestContext Framework available at runtime
within a GraalVM native image.
TestContextRuntimeHints is registered automatically via the
"META-INF/spring/aot.factories" file in spring-test.
This commit also modifies TestContextAotGeneratorTests to assert the
expected runtime hints registered by TestContextRuntimeHints as well as
runtime hints for TestExecutionListener and ContextCustomizerFactory
implementations registered by SpringFactoriesLoaderRuntimeHints.
Closes gh-29028
Closes gh-29044
741ee960e2