Enable IPU for EL 9.6 (and drop EL 8.8/9.2)

[pirat89]

• Add product certificates for RHEL 9.6
• Introduce upgrade path 8.10 -> 9.6
• Drop IPUs related to EL 8.8 and 9.2
  • This will not be supported in this release.
  • Keeping for now still IPU 8.10 -> 9.5 as it is a fresh release so it has a value for us to run tests there. We will drop it later during this lifecycle (CTC-2?).
• Update tests in packit
  • Note that tests for 9.6 could be failing for a while until composes are created.

jira: RHEL-67621

[github-actions]

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[tomasfratrik]

lgtm!