Cleanup branches after release process is completed

[luke-hill]

🤔 What's the problem you're trying to solve?

When fully completing a release gracefully, the branch doesn't auto-clean up.

Some repos have 20+ protected branches we cannot delete manually

✨ What's your proposed solution?

Some way / job after polyglot release finishes that deletes the branch after the release works

⛏ Have you considered any alternatives or workarounds?

📚 Any additional context?

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[mpkorstanje]

When we made polyglot release, protected branches were the only way to run jobs in a protected environment.

These can be replaced with protected tags now. But someone would have to go through all the repos and change GitHub action triggers and branch protection rules.