Part of #23318
Add menu in repo settings to allow for repo admin to decide not just if
projects are enabled or disabled per repo, but also which kind of
projects (repo-level/owner-level) are enabled. If repo projects
disabled, don't show the projects tab.
![grafik](https://github.com/go-gitea/gitea/assets/47871822/b9b43fb4-824b-47f9-b8e2-12004313647c)
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Co-authored-by: delvh <dev.lh@web.de>