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

idea/testData/quickfix/autoImports/namelessFunction.kt

@@ -0,0 +1,7 @@
+// "class com.intellij.codeInsight.daemon.impl.quickfix.ImportClassFixBase" "false"
+// ERROR: Unresolved reference: TTTTT
+// ERROR: Function declaration must have a name
+
+fun () {
+    val tttt : TTTTT = null
+}