Clarify the scope of AotContributingBeanPostProcessor

This commit updates AotContributingBeanPostProcessor so that it
explicitly extends from PriorityOrdered. This makes it more apparent
that AOT contributing bean post processors are meant to be invoked
early with the regular runtime, and shouldn't be post-processed
themselves.

See gh-28047

Author: snicoll

spring-beans/src/main/java/org/springframework/beans/factory/generator/AotContributingBeanPostProcessor.java

@@ -18,12 +18,13 @@
 
 import org.springframework.beans.factory.config.BeanPostProcessor;
 import org.springframework.beans.factory.support.RootBeanDefinition;
+import org.springframework.core.PriorityOrdered;
 import org.springframework.lang.Nullable;
 
 /**
- * Specialization of {@link BeanPostProcessor} that contributes to bean
- * instantiation ahead of time, providing generated code that is equivalent to
- * its runtime behavior.
+ * Specialization of a priority ordered {@link BeanPostProcessor} that
+ * contributes to bean instantiation ahead of time, providing generated code
+ * that is equivalent to its runtime behavior.
  *
  * <p>Contrary to other bean post processors, implementations of this interface
  * are instantiated at build-time and should not rely on other beans in the
@@ -32,8 +33,7 @@
  * @author Stephane Nicoll
  * @since 6.0
  */
-@FunctionalInterface
-public interface AotContributingBeanPostProcessor extends BeanPostProcessor {
+public interface AotContributingBeanPostProcessor extends BeanPostProcessor, PriorityOrdered {
 
 	/**
 	 * Contribute a {@link BeanInstantiationContribution} for the given bean definition,