Deprecate ironic-lib

Ironic-lib functionality has been moved, as needed, into Ironic and
Ironic-Python-Agent.

Release jobs are being kept for active stable branches to ensure we can
release should we have urgent fixes for stable branches until they age
out of support.

Depends-on: https://review.opendev.org/c/openstack/governance/+/939278
Change-Id: If073f91089d19ae0ad8815f6b6e5049e711bbd0a

zuul.d/projects.yaml

@@ -2018,11 +2018,16 @@
     templates:
       - official-openstack-repo-jobs
 
+# NOTE(JayF): ironic-lib is deprecated, but may receive security
+#             fixes on stable branches. Ensure we can release on
+#             stable branches. Last supported ironic-lib is in
+#             2024.2.
 - project:
     name: openstack/ironic-lib
     templates:
       - official-openstack-repo-jobs
-      - publish-to-pypi
+      - publish-to-pypi-stable-only
+      - noop-jobs
 
 - project:
     name: openstack/ironic-prometheus-exporter