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

idea/testData/refactoring/safeDelete/deleteProperty/kotlinPropertyWithJava/override3.java

@@ -0,0 +1,16 @@
+class B extends A {
+    void bar() {
+        setFoo("");
+        System.out.println(getFoo());
+    }
+
+    @Override
+    public String getFoo() {
+        return "foo";
+    }
+
+    @Override
+    public void setFoo(String value) {
+
+    }
+}