[POC] [WIP] IPU 9 -> 10: Initial preparation: upgrade paths and leapp packages def

[pirat89]

Introducing initial changes needed for IPU 9 -> 10 to prevent abouvious crashes and inhibitors:

• extend the list of supported source versions for the upgrade by el9
• define upgrade paths for IPU 9 -> 10
• define packages for RHEL 9 to prevent instant crashing of get_leapp_packages and get_leapp_dep_packages
  • note this could be still changed as the list of packages we will want in el 10 is not defined yet

TODO (required bare minimum changes for the IPU 9 -> 10):

• [ ] add RHEL 10 product certificates
• [ ] add RHEL 10 GPG keys
• [ ] update unit-tests
• [ ] packaging
• [ ] Update Makefile (just partial changes now)
• [ ] Update packit (just partially prepared)