test: migrate test runner message tests to snapshot

PR-URL: #47392
Reviewed-By: Geoffrey Booth <webadmin@geoffreybooth.com>
Reviewed-By: Benjamin Gruenbaum <benjamingr@gmail.com>

Author: MoLow

.github/CODEOWNERS

@@ -135,7 +135,6 @@
 
 # Test runner
 
-/test/message/test_runner_* @nodejs/test_runner
 /test/parallel/test-runner-* @nodejs/test_runner
 /doc/api/test.md @nodejs/test_runner
 /lib/test.js @nodejs/test_runner

test/common/README.md

@@ -642,6 +642,12 @@ environment variables.
 If set, `NODE_COMMON_PORT`'s value overrides the `common.PORT` default value of
 12346\.
 
+### `NODE_REGENERATE_SNAPSHOTS`
+
+If set, test snapshots for a the current test are regenerated.
+for example `NODE_REGENERATE_SNAPSHOTS=1 out/Release/node test/parallel/test-runner-output.mjs`
+will update all the test runner output snapshots.
+
 ### `NODE_SKIP_FLAG_CHECK`
 
 If set, command line arguments passed to individual tests are not validated.