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

idea/testData/quickfix/createFromUsage/createClass/importDirective/classWithQualifier.kt

@@ -0,0 +1,8 @@
+// "Create class 'A'" "true"
+package p
+
+import p.X.<caret>A
+
+class X {
+
+}