Stop running jobs for stable/zed

The zed branch is transitioning to unmaintained, stop testing it and
drop the corresponding periodic jobs.

Change-Id: Ia6722d85b5f1350ab20db4d76f90640bfe979eae
diff --git a/zuul.d/integrated-gate.yaml b/zuul.d/integrated-gate.yaml
index 67a7bb1..1abf5e7 100644
--- a/zuul.d/integrated-gate.yaml
+++ b/zuul.d/integrated-gate.yaml
@@ -228,7 +228,7 @@
     name: tempest-multinode-full-py3
     parent: tempest-multinode-full-base
     nodeset: openstack-two-node-jammy
-    # This job runs on ubuntu Jammy and after stable/zed.
+    # This job runs on ubuntu Jammy and after unmaintained/zed.
     branches:
       regex: ^.*/(victoria|wallaby|xena|yoga|zed)$
       negate: true