meta: add nodejs/test_runner to CODEOWNERS

PR-URL: #45935
Reviewed-By: Geoffrey Booth <[email protected]>
Reviewed-By: Richard Lau <[email protected]>
Reviewed-By: Moshe Atlow <[email protected]>
Reviewed-By: Chengzhong Wu <[email protected]>
Reviewed-By: Darshan Sen <[email protected]>
Reviewed-By: Benjamin Gruenbaum <[email protected]>
Reviewed-By: Rafael Gonzaga <[email protected]>

Author: aduh95

.github/CODEOWNERS

@@ -120,3 +120,12 @@
 
 /.github/workflows/* @nodejs/actions
 /tools/actions/* @nodejs/actions
+
+# 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
+/lib/internal/main/test_runner.js @nodejs/test_runner
+/lib/internal/test_runner/* @nodejs/test_runner