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-test/src/test/java/org/springframework/test/context/support/GenericXmlContextLoaderResourceLocationsTests.java

@@ -51,7 +51,7 @@ class GenericXmlContextLoaderResourceLocationsTests {
 	private static final Log logger = LogFactory.getLog(GenericXmlContextLoaderResourceLocationsTests.class);
 
 
-	@ParameterizedTest(name = "{0}")
+	@ParameterizedTest(name = "[{index}] {0}")
 	@MethodSource("contextConfigurationLocationsData")
 	void assertContextConfigurationLocations(String testClassName, String[] expectedLocations) throws Exception {
 		Class<?> testClass = ClassUtils.forName(getClass().getName() + "$" + testClassName, getClass().getClassLoader());