Update upgrade paths: Add 8.10/9.4

[pirat89]

Adding upgrade paths (RHEL and RHEL with SAP HANA):

• 7.9 -> 8.10
• 8.10 -> 9.4

Following upgrade paths will be dropped later in this release. Consider them as deprecated now.

• 7.9 -> 8.6 (RHEL and RHEL with SAP HANA)
• 7.9 -> 8.9
• 8.6 -> 9.0 (RHEL and RHEL with SAP HANA)
• 8.9 -> 8.3

Additional changes

make pylint happy: ignore too-many-lines in a module (limit 1000). it's a new pylint check and we do not want to address this one.

[github-actions[bot]]

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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-8.9to9.3,kernel-rt-8.9to9.3 to schedule kernel-rt and beaker-minimal test sets for 8.9->9.3 upgrade path

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