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

idea/testData/quickfix/migration/replaceJavaClassAsAnnotationParameter/arrayRuntime.kt.after

@@ -0,0 +1,8 @@
+// "Replace Class<T> with KClass<T> in whole annotation" "true"
+// WITH_RUNTIME
+
+import kotlin.reflect.KClass
+
+annotation class Ann(val arg: Array<KClass<*>>)
+
+Ann(arg = array(String::class, Double::class)) class MyClass