feature: add possibility to use net.naming-scheme

[MichalHe]

Add a possibility to use the net.naming-scheme cmdline argument to make immutable network interface names during the upgrade. The feature can be used only for 8>9 upgrades and higher. To enable the feature, use LEAPP_USE_NET_NAMING_SCHEME=1.

jira: RHEL-23473

[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-8.10to9.4,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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