Pull Up: Move Kotlin -> Kotlin tests to separate directory

idea/testData/refactoring/pullUp/k2k/noClashWithAbstractSuper.kt.after

@@ -0,0 +1,9 @@
+abstract class A<T, U> {
+    // INFO: {"checked": "true"}
+    fun foo(s: String, x: U) {
+
+    }
+}
+
+class B<X>: A<String, X>() {
+}