Packaging changes for DNF => DNF5 upgrade path

[evan-goode]

For the DNF => DNF5 upgrade path in Fedora 39. Part of rpm-software-management/dnf5#469.

See also rpm-software-management/libdnf#1599.

It seems that dnf and yum can't be marked as protected even if DNF5 is still going to provide them.

EDIT: The change to unprotect the dnf package would happen before the other changes, so it has been moved to #1926.

[evan-goode]

This should be ready to go. This PR

• removes ownership of /etc/dnf/dnf.conf, /etc/dnf/vars, and /etc/dnf/protected.d from dnf-data
• makes dnf-data require libdnf5, the new owner of /etc/dnf/dnf.conf. Any packages that require the DNF configuration structure should move to depend on libdnf5 instead of dnf-data, but adding this requirement will stop them from breaking immediately.
• makes dnf-automatic require python3-dnf instead of dnf---it doesn't need the /usr/bin/dnfbinary, just the DNF 4 Python API.

We need to merge this PR and release a new version of DNF before we can merge rpm-software-management/dnf5#469 since the updated DNF 5 spec file need to know the last version number of dnf-data that owns /etc/dnf/dnf.conf.

[jan-kolarik]

LGTM, thanks!