It's confusing right now how the manifest names differ across
fedora-bootc, centos-bootc and rhel-bootc. Both rhel-bootc and
centos-bootc only use "bare" names like `minimal`, and `standard`, while
fedora-bootc prefixes everything with `fedora-`.
For FCOS/SCOS/RHCOS, it would be beneficial to maintain the same naming
across all of those.
Let's just match the naming here to the "bare" version. But add symlinks
so that we don't break the old names (but note that being symlinks, they
will no longer show up in `bootc-base-imagectl list`).
The prow/validate job does some various whitespace checks and
was complaining about these so I guess I'll try to make it happy:
```
[+] Found files with whitespace at the end of line
./fedora-coreos-config/fedora-bootc/.gitlab-ci.yml
./fedora-coreos-config/fedora-bootc/bootc-base-imagectl.md
./fedora-coreos-config/fedora-bootc/fedora-iot.yaml
./fedora-coreos-config/fedora-bootc/iot/manifest.yaml
[+] Found files with missing empty line at end of file
./fedora-coreos-config/fedora-bootc/bootc-base-imagectl
./fedora-coreos-config/fedora-bootc/fedora-iot.yaml
./fedora-coreos-config/fedora-bootc/iot/manifest.yaml
```
