Add failing test for #12637

Author: tanishiking

compiler/test/dotc/run-test-pickling.excludelist

@@ -4,6 +4,7 @@
 derive-generic.scala
 eff-dependent.scala
 enum-java
+enum-java-scala
 i5257.scala
 i7212
 i7868.scala

tests/run/enum-java-scala.check

@@ -0,0 +1,2 @@
+Scala: Testme Hello= Hello
+Java: Testme Hello= Hello

tests/run/enum-java-scala/Test.java

@@ -0,0 +1,7 @@
+// see: https://github.com/scala/scala3/issues/12637
+public class Test {
+    public static void main(String[] args) {
+        TestenumS.go();
+        System.out.println("Java: Testme Hello= " + Testme.Hello);
+    }
+}

tests/run/enum-java-scala/Testme.scala

@@ -0,0 +1,5 @@
+object TestenumS:
+  def go() = println("Scala: Testme Hello= " + Testme.Hello)
+
+enum Testme extends java.lang.Enum[Testme]:
+  case Hello