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

idea/testData/quickfix/createFromUsage/createVariable/localVariable/inMultiLineLambdaWithParams.kt

@@ -0,0 +1,8 @@
+// "Create local variable 'foo'" "true"
+// ACTION: Create parameter 'foo'
+
+fun test(n: Int) {
+    val f: (Int, Int) -> Int = { a, b ->
+        <caret>foo
+    }
+}