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

idea/testData/quickfix/createFromUsage/createClass/referenceExpression/enumEntryWithReceiver.kt

@@ -0,0 +1,11 @@
+// "Create enum constant 'A'" "false"
+// ACTION: Create extension property 'A'
+// ACTION: Create property 'A'
+// ERROR: Unresolved reference: A
+package p
+
+fun foo() = X().<caret>A
+
+class X {
+
+}