[Leapp][IPU7>8] "yum clean all" fails while using cdn.redhat.com

Issue

The following error can be seen in the leapp report:

2024-09-02 21:09:08.375126 [ERROR] Actor: target_userspace_creator
Message: Unable to use yum successfully
 :
Summary:
    Details: Command ['systemd-nspawn', '--register=no', '--quiet', '-D', '/var/lib/leapp/scratch/mounts/root_/system_overlay', '--setenv=LEAPP_UPGRADE_PATH_TARGET_RELEASE=8.10', '--setenv=LEAPP_NO_RHSM=0', '--setenv=LEAPP_EXPERIMENTAL=0', '--setenv=LEAPP_TARGET_PRODUCT_CHANNEL=ga', '--setenv=LEAPP_UPGRADE_PATH_FLAVOUR=default', '--setenv=LEAPP_COMMON_TOOLS=:/etc/leapp/repos.d/system_upgrade/common/tools:/etc/leapp/repos.d/system_upgrade/el7toel8/tools', '--setenv=LEAPP_OVL_IMG_FS_EXT4=1', '--setenv=LEAPP_COMMON_FILES=:/etc/leapp/repos.d/system_upgrade/common/files:/etc/leapp/repos.d/system_upgrade/el7toel8/files', '--setenv=LEAPP_IPU_IN_PROGRESS=7to8', '--setenv=LEAPP_UNSUPPORTED=0', '--setenv=LEAPP_EXECUTION_ID=36cbb498-a800-4500-88c7-1b7c9a22fadc', '--setenv=LEAPP_HOSTNAME=XXX', 'yum', 'clean', 'all'] failed with exit code 1.
 :
            There are no enabled repos.
             Run "yum repolist all" to see the repos you have.
             To enable Red Hat Subscription Management repositories:
                 subscription-manager repos --enable <repo>
             To enable custom repositories:
                 yum-config-manager --enable <repo>