[puppet][murano] Retiring puppet-murano

Hello,

As you may know, TC decided to exclude Murano from 2024.1 release because of its health status[1].

Based on this fact, and also another fact that puppet-murano has had no real development activities for long, I'd propose retiring puppet-murano now. It may be too late to make release deliverable decision. However our puppet modules are tightly coupled with openstack release cycles and we can't assure compatibility between our modules and inactive components, which are no longer aligned with the consistent release cycle.

Please let me know if you have any concerns.

Thank you, Takashi

[1] https://lists.openstack.org/archives/list/openstack-discuss@lists.openstack....