Switch to publishing on tags

### 🤔 What's the problem you've observed?

We are currently publishing of branches. This results in a large number of branches in each repository. We are not using tags, when we created our release process tags could not be protected.
This is no longer the case.

### ✨ Do you have a proposal for making it better?

0. Protect tags (already done).
1. Add tags to the protected Release environment.
2. Switch all the release actions to trigger on a pushed tag. Either `v[0-9]+.[0-9]+.[0-9]+` or `go/v[0-9]+.[0-9]+.[0-9]+`.
3. Stop creating release branches with polyglot-release.
4. Remove all release branches
5. Remove release branches from the protected Release environment.

### 📚 Any additional context?

_No response_