Safe Delete: Move test classes and test data to refactoring directory

idea/testData/refactoring/safeDelete/deleteProperty/kotlinProperty/implement2.kt

@@ -0,0 +1,14 @@
+interface A {
+    val foo: String
+}
+
+interface Z {
+    val foo: String
+}
+
+class B: A, Z {
+    override val <caret>foo: String
+        get() {
+            return "B"
+        }
+}