feat(net-naming-scheme): enable by default

[MichalHe]

This commit enables the use of net.naming-scheme for 8>9 upgrades by default. The previously used environmental variable LEAPP_USE_NET_NAMING_SCHEMES is replaced with LEAPP_DISABLE_NET_NAMING_SCHEMES with inverse semantics.

jira: https://issues.redhat.com/browse/RHEL-23473

[github-actions]

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[pirat89]

lgtm. untested

[matejmatuska]

Tested:
On RHEL 8 with LEAPP_DISABLE_NET_NAMING_SCHEMES=0, the actor does run:

Skipping generation of .link files renaming NICs as net.naming-scheme {LEAPP_DISABLE_NET_NAMING_SCHEMES != 1} is enabled and upgrade is 8>9

On RHEL 7, 8 with LEAPP_DISABLE_NET_NAMING_SCHEMES=1 and 9 it's not logger and correctly disabled.

LGTM.

[matejmatuska]

/packit retest-failed

[matejmatuska]

/packit test

[matejmatuska]

LGTM. Ondemand tests were not intended to be ran. Some of the other are failing because of known infra issue. Merging