🚀 Feature: Use GitHub's new rulesets feature instead of branch protections

[JoshuaKGoldberg]

Bug Report Checklist

• I have tried restarting my IDE and the issue persists.
• I have pulled the latest main branch of the repository.
• I have searched for related issues and found none that matched my issue.

Overview

Thanks @voxpelli for throwing this my way! https://docs.github.com/en/repositories/configuring-branches-and-merges-in-your-repository/managing-rulesets/creating-rulesets-for-a-repository#creating-a-branch-or-tag-ruleset

Looks like there's API support: https://docs.github.com/en/rest/repos/rules?apiVersion=2022-11-28

Is this something that we should replace the existing branch protection features with?

Additional Info

Co-authored-by: @voxpelli

[JoshuaKGoldberg]

The feature is looking pretty stable now and seems to have all the parts I need. Plus, unlike classic branch protections, rulesets don't require the branch to already exist. This will be helpful for the create engine onboarding to let the script run before the repository has had its initial commit pushed. I'll take this on now.

[JoshuaKGoldberg]

@all-contributors please add @voxpelli for ideas.

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[allcontributors]

@JoshuaKGoldberg

I've put up a pull request to add @voxpelli! 🎉