Support multiple @ImportRuntimeHints in the type hierarchy

This commit copies and adapts the logic from
DefaultListableBeanFactory#findMergedAnnotationOnBean
private method to make it suitable for returning multiple
annotations found in the type hierarchy in order
to support this use case with @ImportRuntimeHints.

Closes gh-29361

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

@@ -46,6 +46,7 @@ import static org.assertj.core.api.Assertions.assertThatThrownBy;
  * Tests for {@link RuntimeHintsBeanFactoryInitializationAotProcessor}.
  *
  * @author Brian Clozel
+ * @author Sebastien Deleuze
  */
 class RuntimeHintsBeanFactoryInitializationAotProcessorTests {
 
@@ -68,6 +69,15 @@ class RuntimeHintsBeanFactoryInitializationAotProcessorTests {
 		assertThatSampleRegistrarContributed();
 	}
 
+	@Test
+	void shouldProcessRegistrarsOnInheritedConfiguration() {
+		GenericApplicationContext applicationContext = createApplicationContext(
+				ExtendedConfigurationWithHints.class);
+		this.generator.processAheadOfTime(applicationContext,
+				this.generationContext);
+		assertThatInheritedSampleRegistrarContributed();
+	}
+
 	@Test
 	void shouldProcessRegistrarOnBeanMethod() {
 		GenericApplicationContext applicationContext = createApplicationContext(
@@ -121,6 +131,14 @@ class RuntimeHintsBeanFactoryInitializationAotProcessorTests {
 				.anyMatch(bundleHint -> "sample".equals(bundleHint.getBaseName()));
 	}
 
+	private void assertThatInheritedSampleRegistrarContributed() {
+		assertThatSampleRegistrarContributed();
+		Stream<ResourceBundleHint> bundleHints = this.generationContext.getRuntimeHints()
+				.resources().resourceBundleHints();
+		assertThat(bundleHints)
+				.anyMatch(bundleHint -> "extendedSample".equals(bundleHint.getBaseName()));
+	}
+
 	private GenericApplicationContext createApplicationContext(
 			Class<?>... configClasses) {
 		GenericApplicationContext applicationContext = new GenericApplicationContext();
@@ -138,6 +156,10 @@ class RuntimeHintsBeanFactoryInitializationAotProcessorTests {
 	static class ConfigurationWithHints {
 	}
 
+	@Configuration(proxyBeanMethods = false)
+	@ImportRuntimeHints(ExtendedSampleRuntimeHintsRegistrar.class)
+	static class ExtendedConfigurationWithHints extends ConfigurationWithHints {
+	}
 
 	@Configuration(proxyBeanMethods = false)
 	static class ConfigurationWithBeanDeclaringHints {
@@ -159,6 +181,15 @@ class RuntimeHintsBeanFactoryInitializationAotProcessorTests {
 
 	}
 
+	public static class ExtendedSampleRuntimeHintsRegistrar implements RuntimeHintsRegistrar {
+
+		@Override
+		public void registerHints(RuntimeHints hints, ClassLoader classLoader) {
+			hints.resources().registerResourceBundle("extendedSample");
+		}
+
+	}
+
 	@Configuration(proxyBeanMethods = false)
 	@ImportRuntimeHints(IncrementalRuntimeHintsRegistrar.class)
 	static class ConfigurationWithIncrementalHints {