fix the `generate_changelog` to properly identify commits
The following discussion from !123 should be addressed: - [ ] @vshushlin started a [discussion](https://gitlab.com/gitlab-org/release-cli/-/merge_requests/123#note_819712461): (+1 comment) > I think we need to follow-up to fix the `generate_changelog` script since most of the changes were picked into the `Other changes` category. IIRC I had to manually move some stuff around last time too :sweat:
issue