Simplify test helpers

Author: ehmicky

test/helpers/normalize.js

@@ -47,8 +47,6 @@ const REPLACEMENTS = [
   [/(([ \t]+)at STACK TRACE(\r?\n)?)+/gu, '$2at STACK TRACE$3'],
   // Default Node.js warnings show PID, which we remove
   [/\(node:\d+\)/gu, '(node:PID)'],
-  // Default Node.js warnings in >=14 show this additional warning
-  [/\n.*--trace-warnings \.\.\..*/gu, ''],
   // File paths
   [/[^ (]+\/[^ )]+/gu, ''],
   // Durations in test runners:

test/snapshots/warnings.js.md

@@ -16,7 +16,8 @@ Generated by [AVA](https://avajs.dev).
 > Snapshot 1
 
     `(node:PID) [500] WarningType: message␊
-    Detail`
+    Detail␊
+    (Use \`node --trace-warnings ...\` to show where the warning was created)`
 
 ## should work with warnings-related CLI flags | uncaughtException "--no-warnings"