Deprecate spring context indexer

This commit deprecates the context indexer as our efforts on the AOT
engine cover the indexer in a much broader fashion.

Closes gh-30431

spring-orm/src/main/java/org/springframework/orm/jpa/persistenceunit/PersistenceManagedTypesScanner.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2022 the original author or authors.
+ * Copyright 2002-2023 the original author or authors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -52,6 +52,7 @@ import org.springframework.util.ResourceUtils;
  * @author Stephane Nicoll
  * @since 6.0
  */
+@SuppressWarnings("removal") // components index
 public final class PersistenceManagedTypesScanner {
 
 	private static final String CLASS_RESOURCE_PATTERN = "/**/*.class";