[IPU 8 -> 9] Inhibit incompatible ARM upgrades to RHEL 9.5

[dkubek]

Due to an incompatibility of RHEL8 bootloader with newer versions of kernel on RHEL9 since version 9.5 the upgrade cannot be performed as the old bootloader is used to load the new versions of kernel during the upgrade.

TODO:

• [x] add ~KCS~ docs link

JIRA: 41193, 52993

Introduced shortened URL:

• https://red.ht/upgrading-rhel8-to-rhel9-known-issues

[github-actions[bot]]

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• review please @oamg/developers to notify leapp developers of the review request
• /packit copr-build to submit a public copr build using packit

Packit will automatically schedule regression tests for this PR's build and latest upstream leapp build. However, here are additional useful commands for packit:

• /packit test to re-run manually the default tests
• /packit retest-failed to re-run failed tests manually
• /packit test oamg/leapp#42 to run tests with leapp builds for the leapp PR#42 (default is latest upstream - master - build)

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It is possible to schedule specific on-demand tests as well. Currently 2 test sets are supported, beaker-minimal and kernel-rt, both can be used to be run on all upgrade paths or just a couple of specific ones. To launch on-demand tests with packit:

• /packit test --labels kernel-rt to schedule kernel-rt tests set for all upgrade paths
• /packit test --labels beaker-minimal-8.10to9.4,kernel-rt-8.10to9.4 to schedule kernel-rt and beaker-minimal test sets for 8.10->9.4 upgrade path

See other labels for particular jobs defined in the .packit.yaml file.

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