23.03.1 release updates

Update publishing target to push to candidate channel.

Refresh bundles to deploy from candidate channel for testing.

Update .gitreview default branch.

Change-Id: I3bd27278543b92311c1461264cfeeb98f84bdd1b

.gitreview

@@ -2,4 +2,4 @@
 host=review.opendev.org
 port=29418
 project=x/charm-ovn-central-k8s.git
-defaultbranch=main
+defaultbranch=stable/23.03.1

osci.yaml

@@ -7,4 +7,4 @@
       build_type: charmcraft
       publish_charm: true
       charmcraft_channel: 2.0/stable
-      publish_channel: 23.03/edge
+      publish_channel: 23.03/candidate

tests/bundles/smoke.yaml

@@ -20,12 +20,12 @@ applications:
     trust: false
   rabbitmq:
     charm: ch:rabbitmq-k8s
-    channel: 3.9/edge
+    channel: 3.9/candidate
     scale: 1
     trust: true
   keystone:
     charm: ch:keystone-k8s
-    channel: 2023.1/edge
+    channel: 2023.1/candidate
     scale: 1
     trust: true
     options:
@@ -35,24 +35,24 @@ applications:
       credential-keys: 5M
   glance:
     charm: ch:glance-k8s
-    channel: 2023.1/edge
+    channel: 2023.1/candidate
     scale: 1
     trust: true
     storage:
       local-repository: 5G
   nova:
     charm: ch:nova-k8s
-    channel: 2023.1/edge
+    channel: 2023.1/candidate
     scale: 1
     trust: true
   placement:
     charm: ch:placement-k8s
-    channel: 2023.1/edge
+    channel: 2023.1/candidate
     scale: 1
     trust: true
   neutron:
     charm: ch:neutron-k8s
-    channel: 2023.1/edge
+    channel: 2023.1/candidate
     scale: 1
     trust: true
   ovn-central:
@@ -66,7 +66,7 @@ applications:
       ovn-northd-image: ghcr.io/openstack-snaps/ovn-northd:23.03
   tls-operator:
     charm: tls-certificates-operator
-    channel: edge
+    channel: stable
     scale: 1
     options:
       generate-self-signed-certificates: true