Configure index in @ParameterizedTest display names

This commit prepends "[{index}] " to all custom display names
configured via @ParameterizedTest.

This provides better diagnostics between the "technical names" reported
on the CI server vs. the "display names" reported within a developer's
IDE.

See gh-23451

spring-webmvc/src/test/java/org/springframework/web/servlet/mvc/method/annotation/HandlerMethodAnnotationDetectionTests.java

@@ -116,7 +116,7 @@ class HandlerMethodAnnotationDetectionTests {
 	}
 
 
-	@ParameterizedTest(name = "controller [{0}], auto-proxy [{1}]")
+	@ParameterizedTest(name = "[{index}] controller [{0}], auto-proxy [{1}]")
 	@MethodSource("handlerTypes")
 	void testRequestMappingMethod(Class<?> controllerType, boolean useAutoProxy) throws Exception {
 		setUp(controllerType, useAutoProxy);