build: implement a Commit Queue in Actions

This is a (still experimental) implementation of a Commit Queue on
GitHub Actions, using labels and the scheduler event to land Pull
Requests. It uses `node-core-utils` to validate Pull Requests and to
prepare the commit message, and then it uses a GitHub personal token to
push changes back to the repository. If the Queue fails to land a Pull
Request, that PR will be removed from the queue and the
`node-core-utils` output will be pasted in the Pull Request.

An overview of the implementation is provided in
doc/guides/commit-queue.md, as well as current limitations.

Ref: https://github.com/mmarchini-oss/automated-merge-test
Ref: https://github.com/nodejs/build/issues/2201

PR-URL: https://github.com/nodejs/node/pull/34112
Refs: https://github.com/mmarchini-oss/automated-merge-test
Refs: https://github.com/nodejs/build/issues/2201


Reviewed-By: Ben Noordhuis <info@bnoordhuis.nl>
Reviewed-By: Denys Otrishko <shishugi@gmail.com>
Reviewed-By: Anna Henningsen <anna@addaleax.net>
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Shelley Vohr <codebytere@gmail.com>
Reviewed-By: Matteo Collina <matteo.collina@gmail.com>
Reviewed-By: Richard Lau <riclau@uk.ibm.com>