Retire puppet-rally

puppet-rally has been retired[1]. This marks the project as retired and
remove the file for 2023.2 because we no longer create a new release.

[1] https://review.opendev.org/c/openstack/governance/+/880018/

Change-Id: I7e27e64316007ffc16eb4087205e2000ef28f040

deliverables/wallaby/puppet-rally.yaml

@@ -4,7 +4,9 @@ release-model: cycle-with-intermediary
 team: Puppet OpenStack
 type: trailing
 repository-settings:
-  openstack/puppet-rally: {}
+  openstack/puppet-rally:
+    flags:
+      - retired
 releases:
   - projects:
       - hash: 4c0a0122cbdf02e09a61da4386bd60ed41ac4f4b