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

idea/testData/quickfix/createFromUsage/createFunction/component/createComponentFromUsage3.kt

@@ -0,0 +1,18 @@
+// "Create extension function 'component2'" "true"
+class FooIterator<T> {
+    fun hasNext(): Boolean { return false }
+    fun next(): Any {
+        throw UnsupportedOperationException("not implemented")
+    }
+}
+class Foo<T> {
+    fun iterator(): FooIterator<String> {
+        throw UnsupportedOperationException("not implemented")
+    }
+}
+fun Any.component1(): Int {
+    return 0
+}
+fun foo() {
+    for ((i: Int, j: Int) in Foo<caret><Int>()) { }
+}