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

idea/testData/quickfix/createFromUsage/createClass/referenceExpression/enumByQualifier.kt.after

@@ -0,0 +1,9 @@
+// "Create enum 'A'" "true"
+// ERROR: Unresolved reference: B
+package p
+
+fun foo() = A.B
+
+enum class A {
+
+}