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

idea/testData/quickfix/createFromUsage/createClass/callExpression/callWithLambdaArgOnly.kt

@@ -0,0 +1,5 @@
+// "Create class 'Foo'" "true"
+
+fun test() {
+    val a = <caret>Foo { p: Int -> p + 1 }
+}