The parent issue RHELC-1101 has the label that triggered autocreation of this subtask to track the relative story point estimation for the integration test part of the issue.

The parent issue description at the time of creation of this issue was:
We need to adjust convert2rhel code so that conversions to RHEL 9 work are as seamless as conversions to RHEL 7 and 8.

The source OSes we focus on: Rocky, Alma, Oracle.

Acceptance criteria:

• convert2rhel is updated to allow conversions of Rocky/Alma/Oracle 9 to RHEL 9
  • The pattern is the same as with RHEL 8 - the latest minor version and all minor versions that correspond to RHEL 9 minor versions with active EUS.
    • Except Oracle Linux - that is a rolling distro that does not have older minor version repos => we'll support conversions from the OL9 latest only.
  • Example of minor versions to allow converting:
    • Rocky/Alma 9.0 and 9.2 (both corresponding to active RHEL 9 EUS releases)
    • Rocky/Alma/Oracle 9.3 (latest)
    • Alma/Rocky/Oracle 9.4
    • CentOS Stream 9
• convert2rhel upstream CI is set up to run conversion tests on Rocky/Alma/Oracle 9 for every upstream change before it's merged
• the documentation is updated