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

idea/testData/refactoring/safeDelete/deleteClass/kotlinClassWithJava/classWithDelegationCalls.java

@@ -0,0 +1,5 @@
+class J extends B {
+    public J() {
+        super();
+    }
+}

idea/testData/refactoring/safeDelete/deleteClass/kotlinClassWithJava/classWithDelegationCalls.kt

@@ -0,0 +1,11 @@
+open class <caret>B() {
+    constructor(a: Int): this() {
+
+    }
+}
+
+open class A: B {
+    constructor(a: Int): super() {
+
+    }
+}

idea/testData/refactoring/safeDelete/deleteClass/kotlinClassWithJava/classWithDelegationCalls.kt.messages

@@ -0,0 +1 @@
+class B has 3 usages that are not safe to delete.