Make breaking releases more apparent

[kettanaito]

Right now, a breaking release happens if your commit message contains the phrase "BREAKING CHANGE". Since people can have different merge strategies on GitHub, they may accidentally be putting pull request descriptions into commit messages. Those descriptions may include phrases like "not a breaking change", making Release to treat this commit as a breaking change. It's silly.

Proposal

I have two ideas in mind:

1. Explore if GitHub has approvable actions. I believe I heard something like this teased recently. That would be the ideal approach: when Release thinks a breaking release must happen, it creates an action the maintainer must manually approve. This would eliminate any unexpected releases altogether.
2. Otherwise, drop the dependency on the commit message and manually implement support for the ! character support as per semantic commit messages. The problem is, the third-party lib we're using to parse commit messages doesn't support the fix(some)!: change notation that indicates breaking changes.