Add tool to manage branch protection rules across many repositories

We currently have a branch protection rule in place that protects "release-*" branches in our repositories.

This has drawbacks:

• it will cause release scripts to fail because the newly created release branches cannot be pushed to by the script
• prs on these branches cannot use the merge queue (not possible with wildcards in the branch name)

It might be worth switching to individual protection rules for every release, but that would make them hard to change/administer.

The github api allows managing these rules: https://docs.github.com/en/rest/branches/branch-protection?apiVersion=2022-11-28

We should look into writing a simple python script that takes a list of repos and release names and updates these protection rules.

Issue にリンクされている GitHub branch protection REST API から始め、複数のリポジトリの保護ルールを管理する方法を確認します。スクリプトの入力をリポジトリのリストと release-name のリストとして定義します。release-* ワイルドカードに依存せずにルールを一元的に更新でき、release の push と merge queue が機能すれば完了です。