chore: un-cliwrap and use dnf5 instead of rpm-ostree

[bsherman]

I've been tinkering with and testing dnf5 for a while.

Key items are:

• ensuring cliwrap is properly unwound (checked rpm-ostree Rust code)
• using normal (not wrapped) binaries, eg for dracut
• and the more obvious, replacing "rpm-ostree install" with "dnf5 install", etc
• also uses dnf copr plugin to manage COPRs

Note this does NOT switch to using dnf copr plugin for ublue-os/akmods COPR since doing so removes the RPM managed repo file. That repo file needs to be renamed in the ublue-os-akmods-addons package to match the COPR naming convention.

Relates: #1946

[m2Giles]

We also need to explicitly test on both F40 and F41. We were bitten pretty hard enabling bootc in F40 with bad ISOs.

Additionally, we need to make sure that bootc label is present on our images so that we can integrate with the rest of the bootc ecosystem (F41 is good already)

[tulilirockz]

+1 for F41, it is working perfectly fine indeed

[tulilirockz]

Just realized that this will let us use https://github.com/osbuild/bootc-image-builder/ for the ISOs