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

idea/testData/refactoring/safeDelete/deleteProperty/javaPropertyWithKotlin/middleJava3.kt

@@ -0,0 +1,13 @@
+interface B {
+    public var foo: String
+}
+
+class D: B {
+    public override var foo: String
+        get() {
+            return "D"
+        }
+        set(value: String) {
+            println()
+        }
+}