Add stable/2024.2 jobs on master gate

As 2024.2 is released, we should add its job on master
gate to keep branchless tempest plugins compatible
to stable branch.

Removing zed branch job as that is in unmaintained phase.
We do not need to run the stable jobs in gate pipeline.

Ref: Tempest plugins guide for stable branch testing:
<testin>

Change-Id: I0336522f843100c66cc7f2df5564bb29ebac4df5

.zuul.yaml

@@ -6,18 +6,14 @@
     check:
       jobs:
         - cyborg-tempest
+        - cyborg-tempest-2024-2
         - cyborg-tempest-2024-1
         - cyborg-tempest-2023-2
         - cyborg-tempest-2023-1
-        - cyborg-tempest-zed
         - cyborg-tempest-ipv6-only
     gate:
       jobs:
         - cyborg-tempest
-        - cyborg-tempest-2024-1
-        - cyborg-tempest-2023-2
-        - cyborg-tempest-2023-1
-        - cyborg-tempest-zed
         - cyborg-tempest-ipv6-only
 
 - job:
@@ -163,6 +159,12 @@
     vars: *base_vars
     irrelevant-files: *base_irrelevant_files
 
+- job:
+    name: cyborg-tempest-2024-2
+    parent: cyborg-tempest
+    nodeset: openstack-single-node-jammy
+    override-checkout: stable/2024.2
+
 - job:
     name: cyborg-tempest-2024-1
     parent: cyborg-tempest
@@ -180,9 +182,3 @@
     parent: cyborg-tempest
     nodeset: openstack-single-node-jammy
     override-checkout: stable/2023.1
-
-- job:
-    name: cyborg-tempest-zed
-    parent: cyborg-tempest
-    nodeset: openstack-single-node-focal
-    override-checkout: stable/zed