tools: enable no-unsafe-finally

This enables the `no-unsafe-finally` eslint rule to make sure we
have a proper control flow in try / catch.

PR-URL: https://github.com/nodejs/node/pull/18745


Reviewed-By: Ben Noordhuis <info@bnoordhuis.nl>
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: Luigi Pinca <luigipinca@gmail.com>
Reviewed-By: James M Snell <jasnell@gmail.com>