Reduce need for bean method proxying and disable where not needed

Closes gh-9068

spring-boot-samples/spring-boot-sample-parent-context/src/main/java/sample/parent/SampleParentContextApplication.java

@@ -40,7 +40,7 @@ public class SampleParentContextApplication {
 				.child(SampleParentContextApplication.class).run(args);
 	}
 
-	@Configuration
+	@Configuration(proxyBeanMethods = false)
 	@EnableAutoConfiguration
 	@EnableConfigurationProperties(ServiceProperties.class)
 	protected static class Parent {