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

idea/testData/refactoring/safeDelete/deleteClass/kotlinClass/nestedClass2.kt

@@ -0,0 +1,13 @@
+package test
+
+import test.A.C
+
+class A {
+    class <caret>C {
+
+    }
+}
+
+class B {
+    val x = A.C()
+}