Big change in quickfix tests: no stupid test data format with "before" and "after" file prefixes

idea/testData/quickfix/createFromUsage/createFunction/call/funOnClassNoClassObject.kt

@@ -0,0 +1,9 @@
+// "Create function 'foo'" "false"
+// ACTION: Split property declaration
+// ERROR: Unresolved reference: foo
+
+class A<T>(val n: T)
+
+fun test() {
+    val a: Int = A.<caret>foo(2)
+}