Register runtime hints for @TestPropertySource#locations

This commit introduces automatic registration of runtime hints for
classpath resources configured via the `locations` attribute in
@TestPropertySource as well as for detected default properties files.

Closes gh-29025

spring-test/src/test/java/org/springframework/test/context/aot/TestContextAotGeneratorTests.java

@@ -171,6 +171,10 @@ class TestContextAotGeneratorTests extends AbstractAotTests {
 		// @ContextConfiguration(locations=...)
 		assertThat(resource().forResource("/org/springframework/test/context/aot/samples/xml/test-config.xml"))
 			.accepts(runtimeHints);
+
+		// @TestPropertySource(locations = ... )
+		assertThat(resource().forResource("/org/springframework/test/context/aot/samples/basic/BasicSpringVintageTests.properties"))
+			.accepts(runtimeHints);
 	}
 
 	private static void assertReflectionRegistered(RuntimeHints runtimeHints, String type, MemberCategory memberCategory) {

spring-test/src/test/java/org/springframework/test/context/aot/samples/basic/BasicSpringVintageTests.java

@@ -42,7 +42,7 @@ import static org.assertj.core.api.Assertions.assertThat;
 @RunWith(SpringRunner.class)
 // Override the default loader configured by the CustomXmlBootstrapper
 @ContextConfiguration(classes = BasicTestConfiguration.class, loader = AnnotationConfigContextLoader.class)
-@TestPropertySource(properties = "test.engine = vintage")
+@TestPropertySource
 public class BasicSpringVintageTests {
 
 	@Autowired