Retire puppet-sahara: Retire Repository from the Governance Repository

Sahara was marked inactive during this cycle and has been excluded from
2024.1 release. Because Puppet OpenStack modules are tightly coupled
with OpenStack's release cycle, we agreed to retire this module and
not to create a 2024.1 release.

[1] https://lists.openstack.org/archives/list/openstack-discuss@lists.openstack.org/message/BYGTRBDBLZ5XFYQDWOJHDZ3FVYDPQ3LW/

Depends-on: https://review.opendev.org/c/openstack/puppet-sahara/+/910453
Change-Id: I266d395e73a117f309fe85d98abd1721fef712a3

reference/legacy.yaml

@@ -1970,6 +1970,10 @@ Puppet OpenStack:
       repos:
         - openstack/puppet-qdr
       retired-on: 2024-02-06
+    puppet-sahara:
+      repos:
+        - openstack/puppet-sahara
+      retired-on: 2024-02-28
 
 qinling:
   retired-on: 2020-11-27

reference/projects.yaml

@@ -2141,9 +2141,6 @@ Puppet OpenStack:
     puppet-placement:
       repos:
         - openstack/puppet-placement
-    puppet-sahara:
-      repos:
-        - openstack/puppet-sahara
     puppet-swift:
       repos:
         - openstack/puppet-swift