As part of the improvements in the container experience, we are tweaking the message printed by subscription-manager directly (when running `subscription-manager <command>`) and indirectly (by the "subscription-manager" dnf plugin).

The message will still mention "container mode", and it will be unified between the two situations.

The work will be the backport of the change already done in main for 9.3:
https://github.com/candlepin/subscription-manager/pull/3294/