ship bootc-base-imagectl in Fedora

As an artifact of implementation right now, /usr/libexec/bootc-base-imagectl is only enabled when the base image is built via Containerfile, not the legacy rpm-ostree treefile.

We could do some hacks to enable it that way too, but this immediately circles back to the non-RPM content being painful with that path, which is a huge part of the rationale for doing this in the first place.

So ideally, we switch over to building Fedora via the Containerfile (and more ideally, via Konflux which is noted in tracker#33 (closed) )