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

idea/testData/refactoring/safeDelete/deleteClass/kotlinClass/class2.kt

@@ -0,0 +1,13 @@
+package test
+
+import test.A
+
+class <caret>A {
+
+}
+
+class B: A {
+
+}
+
+val v1 = A::class