Add zuul/zuul-client to gerritbot

The repo zuul-client was recently created but not added to gerritbot,
add it now.

To avoid this in the future, use a regex to include all repos in the
zuul namespace.

Change-Id: I20ee1a2d55fe9c83ea4f5e948b810ad4c06862aa

gerritbot/channels.yaml

@@ -1972,20 +1972,8 @@ zuul:
     - patchset-created
     - change-merged
   projects:
+    - ^zuul/.*
     - opendev/zone-zuul-ci.org
-    - zuul/gcp-authdaemon
-    - zuul/nodepool
-    - zuul/project-config
-    - zuul/zuul
-    - zuul/zuul-base-jobs
-    - zuul/zuul-helm
-    - zuul/zuul-jobs
-    - zuul/zuul-operator
-    - zuul/zuul-preview
-    - zuul/zuul-registry
-    - zuul/zuul-sphinx
-    - zuul/zuul-website
-    - zuul/zuul-website-media
   branches:
     - master
     - feature/gearman-zk-shim