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

idea/testData/quickfix/createFromUsage/createFunction/get/createGetFromUsage2.kt.after

@@ -0,0 +1,8 @@
+// "Create extension function 'get'" "true"
+fun x (y: Any) {
+    val z: Any = y[""]
+}
+
+fun Any.get(s: String): Any {
+    throw UnsupportedOperationException("not implemented") //To change body of created functions use File | Settings | File Templates.
+}