TASK: Drop remnants of dnf-4

[yselkowitz]

What does the ELN SIG need to do?

DNF5 is the default package manager in Fedora 41, and now in ELN (#201). At the same time, dnf-4, libdnf, etc. will see less maintenance, and therefore should also be dropped prior to RHEL 11. However, getting rid of those will take more work, mostly beyond our scope:

• [ ] anaconda needs to be ported to python3-libdnf5
• [ ] kpatch-dnf (RHEL-specific) needs to be ported to python3-libdnf5
• [x] Switch osbuild to use python3-libdnf5 instead of python3-libdnf: https://github.com/osbuild/osbuild/pull/1894
• [ ] PackageKit needs to be ported to libdnf5
• [ ] policycoreutils(-devel) needs to be ported to python3-libdnf5
• [ ] subscription-manager needs to be ported to python3-libdnf5

Trackers: https://tiny.distro.builders/view-rpm--view-eln--python3-dnf.html https://tiny.distro.builders/view-rpm--view-eln--python3-dnf-plugins-core.html

[yselkowitz]

Also, Content Resolver is still using python3-dnf from dnf-4, so that too should be ported to python3-libdnf5: https://github.com/minimization/content-resolver/issues/75

[yselkowitz]

RHBZ tracker: https://bugzilla.redhat.com/show_bug.cgi?id=DNF5 (thanks @michel-slm)