meta: uncomment all codeowners

A recent feature was added to github-bot to ping codeowners defined on
the CODEOWNERS file even if the team doesn't have write permission to
the repository. That means we can enable codeowners everywhere in the
repository.

Ref: https://github.com/nodejs/github-bot/pull/265
Fix: https://github.com/nodejs/node/issues/33984

PR-URL: https://github.com/nodejs/node/pull/34670
Fixes: https://github.com/nodejs/node/issues/33984
Refs: https://github.com/nodejs/github-bot/pull/265


Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Denys Otrishko <shishugi@gmail.com>
Reviewed-By: Matteo Collina <matteo.collina@gmail.com>