Retire openstack-helm-addons

As part of our discussion from the latest PTG, as well as several
prior, one of the goals for the project was to retire any of the
unused repositories under the openstack-helm umbrella.

This change seeks to retire the openstack-helm-addons repo
since it has not been maintained and the existing charts are not
actively supported.

Depends-on: https://review.opendev.org/c/openstack/openstack-helm-addons/+/850890

Change-Id: Iea729e8c591de4d7e1fd680fef575e2a53b1f67f

reference/legacy.yaml

@@ -668,6 +668,10 @@ OpenStackHelm:
   service: Helm charts for deploying OpenStack
   url: https://wiki.openstack.org/wiki/Openstack-Helm
   deliverables:
+    openstack-helm-addons:
+      retired-on: 2022-08-03
+      repos:
+        - openstack/openstack-helm-addons
     openstack-helm-deployments:
       retired-on: 2022-06-24
       repos:

reference/projects.yaml

@@ -1755,10 +1755,6 @@ OpenStack-Helm:
       release-management: external
       repos:
         - openstack/openstack-helm
-    openstack-helm-addons:
-      release-management: external
-      repos:
-        - openstack/openstack-helm-addons
     openstack-helm-images:
       release-management: external
       repos: