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

idea/testData/quickfix/autoImports/libraryPropertyJsRuntime.kt.after

@@ -0,0 +1,9 @@
+// "Import" "true"
+
+package test
+
+import kotlin.js.dom.html5.localStorage
+
+fun foo() {
+    localStorage
+}