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

idea/testData/quickfix/addStarProjections/javaClass/fooOfC2.kt

@@ -0,0 +1,9 @@
+// "class org.jetbrains.kotlin.idea.quickfix.AddStarProjectionsFix" "false"
+// ERROR: Type argument expected
+class C2<T>
+
+fun foo<T>() {}
+
+fun test() {
+    foo<C2<caret>>()
+}