util: mark special entries as such

This adds the color code to special entries if colors are active.

PR-URL: https://github.com/nodejs/node/pull/22287


Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Gus Caplan <me@gus.host>
Reviewed-By: Trivikram Kamat <trivikr.dev@gmail.com>
Reviewed-By: Luigi Pinca <luigipinca@gmail.com>