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

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

@@ -0,0 +1,30 @@
+// WITH_RUNTIME
+interface T {
+    // INFO: {"checked": "true"}
+    val x: Int
+    // INFO: {"checked": "true"}
+    val y: Int get() = 2
+    // INFO: {"checked": "true"}
+    val z: Int
+    // INFO: {"checked": "true"}
+    val t: Int
+
+    // INFO: {"checked": "true"}
+    fun foo(n: Int): Boolean = n > 0
+
+    // INFO: {"checked": "true"}
+    fun bar(s: String)
+
+    // INFO: {"checked": "true"}
+    class Y {
+
+    }
+}
+
+abstract class B: T {
+    // INFO: {"checked": "true"}
+    override val x = 1
+    // INFO: {"checked": "true"}
+    override val z: Int by lazy { 3 }
+
+}