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

idea/testData/quickfix/createFromUsage/createFunction/get/createGetFromUsage7.kt

@@ -0,0 +1,8 @@
+// "Create function 'get'" "true"
+import java.util.ArrayList
+
+class Foo<T> {
+    fun <T, V> x (y: Foo<List<T>>, w: ArrayList<V>, v: T) {
+        val z: Iterable<T> = y<caret>["", w, v]
+    }
+}