Release: Use GitHub automatic release notes

[danirabbit]

Problem

These changelogs are mostly useful for maintainers and packagers but we're using the user-facing release notes from metainfo. We also now have the problem that the release action doesn't know what to do with the issues tag

Proposal

While the release action has been broken for creating release tags we've been using Github's automatic release notes generation and it's been fine? It does a good enough job just summarizing the commits and it's kinda neat that it has like "so and so made their first commit in this release" kind of stuff. So we probably don't actually need to be doing anything fancy here?

Prior Art (Optional)

See also #24