Leverage Java reflection for Kotlin enums

As discussed in KT-25165, from a Kotlin POV enum constructors
have no parameter, this is an "implementation detail"
required for running on the JVM, so it seems relevant to skip
Kotlin reflection in that case and just delegate to Java
reflection.

Issue: SPR-16931

spring-core/src/main/java/org/springframework/core/KotlinReflectionParameterNameDiscoverer.java

@@ -58,7 +58,7 @@ public class KotlinReflectionParameterNameDiscoverer implements ParameterNameDis
 	@Override
 	@Nullable
 	public String[] getParameterNames(Constructor<?> ctor) {
-		if (!KotlinDetector.isKotlinType(ctor.getDeclaringClass())) {
+		if (ctor.getDeclaringClass().isEnum() || !KotlinDetector.isKotlinType(ctor.getDeclaringClass())) {
 			return null;
 		}