@risottobias Bookmarking this in case you get some interesting references, and:
https://www.atlassian.com/git/tutorials/comparing-workflows
The Atlassian reference is popular-ish, but also, maybe this is just my experience, I think many organizations are either "just" using a feature branch+pull request or fork+pull request workflow, or they've got their own similar-but-different workflow supported by their own internal tools (ie, Google/Meta/etc), eg:
https://gerrit.googlesource.com/git-repo
https://www.kubernetes.dev/docs/guide/github-workflow/