Stop running jobs for GitHub repos

As a first step to removing the Kata tenant, stop running jobs
for repositories on GitHub. Those are no longer in the "required"
checks for any repo/branch, and are being replaced by GitHub actions
performing the same check.

Change-Id: I06e7998b5da402549bd6fdcc6a2802814c6dddcb

zuul.d/projects.yaml

@@ -10,63 +10,3 @@
     gerrit-gate:
       jobs:
         - kata-zuul-jobs-linters
-
-- project:
-    name: kata-containers/agent
-    templates:
-      - kata-pre-checks
-
-- project:
-    name: kata-containers/ci
-    templates:
-      - kata-pre-checks
-
-- project:
-    name: kata-containers/community
-    templates:
-      - kata-pre-checks
-
-- project:
-    name: kata-containers/documentation
-    templates:
-      - kata-pre-checks
-
-- project:
-    name: kata-containers/kata-containers
-    templates:
-      - kata-pre-checks
-
-- project:
-    name: kata-containers/ksm-throttler
-    templates:
-      - kata-pre-checks
-
-- project:
-    name: kata-containers/osbuilder
-    templates:
-      - kata-pre-checks
-
-- project:
-    name: kata-containers/packaging
-    templates:
-      - kata-pre-checks
-
-- project:
-    name: kata-containers/proxy
-    templates:
-      - kata-pre-checks
-
-- project:
-    name: kata-containers/runtime
-    templates:
-      - kata-pre-checks
-
-- project:
-    name: kata-containers/shim
-    templates:
-      - kata-pre-checks
-
-- project:
-    name: kata-containers/tests
-    templates:
-      - kata-pre-checks