Problem
There is JT satellite-leapp-upgrade that can currently handle only RHEL7 -> RHEL8 upgrade path (for Satellite 6.11) and allows leapp installation only from CDN.
Solution
Extend JT satellite-leapp-upgrade to handle also RHEL8 -> RHEL9 upgrade path (for Satellite 6.16) and allow installation from brew as the correct leapp is not yet released.