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

idea/testData/quickfix/autoImports/libraryClassJsRuntime.kt

@@ -0,0 +1,8 @@
+// "Import" "true"
+// ERROR: Please specify constructor invocation; classifier 'HTMLStyleElement' does not have a companion object
+
+package test
+
+fun foo() {
+    <caret>HTMLStyleElement
+}