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

idea/testData/refactoring/safeDelete/deleteFunction/kotlinFunction/override1.kt

@@ -0,0 +1,11 @@
+open class A {
+    open fun foo() {
+
+    }
+}
+
+class B: A {
+    override fun <caret>foo() {
+
+    }
+}