Remove non voting arm64 jobs from stable branches

arm64 jobs are failing 100% and those are not fixes on
master. It does not make sense to carry forward these broken
testing to stable. until those are fixed on master, we should
not run them on stable.

generic template openstack-python3-jobs-arm64 will take
care of running arm64 jobs on stable branches once jobs
are passing.

Needed-By: https://review.opendev.org/c/openstack/openstack-zuul-jobs/+/954781

Change-Id: Ieb1b116c4d0866bd8208f9b8b440c1e274c82b1c
Signed-off-by: Ghanshyam Mann <[email protected]>
(cherry picked from commit d7e79d1)
(cherry picked from commit eea4c1855e5adade2de3212f88363017ba55157d)
(cherry picked from commit a35f555)
(cherry picked from commit 9d51d8f)
(cherry picked from commit 7227063)

Author: gmaanos

zuul.d/job-templates.yaml

@@ -31,14 +31,6 @@
         - openstack-tox-cover:  # from openstack-cover-jobs template
             timeout: 4800
             irrelevant-files:  *irrelevant-files
-    check-arm64:
-      jobs:
-        - openstack-tox-py38-arm64: # from openstack-python3-yoga-jobs-arm64 template
-            timeout: 4800
-            irrelevant-files:  *irrelevant-files
-        - openstack-tox-py39-arm64: # from openstack-python3-yoga-jobs-arm64 template
-            timeout: 4800
-            irrelevant-files:  *irrelevant-files
     gate:
       jobs:
         - openstack-tox-py36:  # from openstack-python3-yoga-jobs template