CI: Disable CentOS/Rocky/Ubuntu aarch64 jobs

Since Linaro shut down their nodepool provider - OpenDev infra
is left with OSUOSL cloud with max 15 instances running - let's
not put any additional strain on CI (especially that it seems
there are some I/O or similar issues that cause our jobs to
time out).

Change-Id: I7f0f723b37e552c4ea01bf51b6354209608d904a
(cherry picked from commit fd4f1a8)

Author: mnasiadka

.zuul.d/centos.yaml

@@ -4,9 +4,6 @@
       jobs:
         - kolla-build-centos9s
         - kolla-ansible-centos9s
-    check-arm64:
-      jobs:
-        - kolla-build-centos9s-aarch64
     experimental:
       jobs:
         - kolla-build-no-infra-wheels-centos9s