Add test to validate AOT infrastructure registration

See gh-28561

spring-beans/src/test/java/org/springframework/beans/factory/aot/BeanRegistrationsAotProcessorTests.java

@@ -33,6 +33,13 @@
  */
 class BeanRegistrationsAotProcessorTests {
 
+	@Test
+	void beanRegistrationsAotProcessorIsRegistered() {
+		assertThat(new AotFactoriesLoader(new DefaultListableBeanFactory())
+				.load(BeanFactoryInitializationAotProcessor.class))
+				.anyMatch(BeanRegistrationsAotProcessor.class::isInstance);
+	}
+
 	@Test
 	void processAheadOfTimeReturnsBeanRegistrationsAotContributionWithRegistrations() {
 		BeanRegistrationsAotProcessor processor = new BeanRegistrationsAotProcessor();