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

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

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