Polish CorsConfigurationSource Selection Logic

Issue gh-16501

Author: jzheaux

Diff for: config/src/main/java/org/springframework/security/config/annotation/web/configurers/CorsConfigurer.java

@@ -107,7 +107,7 @@ static class MvcCorsFilter {
 		 * @return
 		 */
 		private static CorsFilter getMvcCorsFilter(ApplicationContext context) {
-			if (context.getBeanNamesForType(CorsConfigurationSource.class).length > 0) {
+			if (context.containsBean(HANDLER_MAPPING_INTROSPECTOR_BEAN_NAME)) {
 				CorsConfigurationSource corsConfigurationSource = context
 					.getBean(HANDLER_MAPPING_INTROSPECTOR_BEAN_NAME, CorsConfigurationSource.class);
 				return new CorsFilter(corsConfigurationSource);