Allow Default Ordering for TargetVisitor

In tests, we want to both test that functionality works and also
demonstrate common or expected usage, where possible. It is likely
incorrect to use @Order(0) for a target visitor as this states that
it should take precedence over all Spring Security visitors defined
at a lower precedence.

Also, it appears this may have been added this way because of a mock
visitor that appears to be unused by any tests. Further, when an
application has multiple visitors, they should use the TargetVisitor.of
method to publish one bean with the order determined by the order
of the method parameters instead of having two separate beans.

This commit removes the @Order(0) annotation and also the mock
visitor, deferring to the natural ordering afforded by the
framework.

Issue gh-15994

config/src/test/java/org/springframework/security/config/annotation/method/configuration/PrePostMethodSecurityConfigurationTests.java

@@ -40,7 +40,6 @@ import org.junit.jupiter.api.Test;
 import org.junit.jupiter.api.extension.ExtendWith;
 import org.junit.jupiter.params.ParameterizedTest;
 import org.junit.jupiter.params.provider.ValueSource;
-import org.mockito.Mockito;
 
 import org.springframework.aop.Advisor;
 import org.springframework.aop.Pointcut;
@@ -1831,8 +1830,8 @@ public class PrePostMethodSecurityConfigurationTests {
 
 		@Bean
 		@Role(BeanDefinition.ROLE_INFRASTRUCTURE)
-		static TargetVisitor customTargetVisitor() {
-			return TargetVisitor.of(Mockito.mock(), TargetVisitor.defaultsSkipValueTypes());
+		static TargetVisitor skipValueTypes() {
+			return TargetVisitor.defaultsSkipValueTypes();
 		}
 
 		@Bean