[CI] [to-revert] Avoid upgrades on CentOS Stream 8

CentOS Stream 8 currently has a bug which makes it require root
privileges for ping.
A workaround patch (see needed-by below) has been proposed, yet
the dependency on previous branches via the upgrade jobs make it
fail the CI.
Thus, this patch temporarily disables those jobs on CentOS Stream 8.
This patch is to be reverted once we patch the affected branches.

Needed-By: https://review.opendev.org/c/openstack/kolla-ansible/+/824681
Change-Id: I827ed30d0247f21478a45d96ae8396ec0e778d3b

zuul.d/project.yaml

@@ -33,7 +33,6 @@
         - kolla-ansible-centos8s-source-ironic
         - kolla-ansible-centos8s-binary-ironic
         - kolla-ansible-ubuntu-source-ironic
-        - kolla-ansible-centos8s-source-upgrade
         - kolla-ansible-debian-source-upgrade
         - kolla-ansible-ubuntu-source-upgrade
         - kolla-ansible-centos8s-binary
@@ -50,7 +49,6 @@
         - kolla-ansible-centos8s-source-monasca
         - kolla-ansible-centos8s-source-cephadm
         - kolla-ansible-ubuntu-source-cephadm
-        - kolla-ansible-centos8s-source-upgrade-cephadm
         - kolla-ansible-ubuntu-source-upgrade-cephadm
         - kolla-ansible-centos8s-hashi-vault
     check-arm64:
@@ -61,12 +59,10 @@
       queue: kolla
       jobs:
         - kolla-ansible-centos8s-source
-        - kolla-ansible-centos8s-source-upgrade
         - kolla-ansible-debian-source
         - kolla-ansible-debian-source-upgrade
         - kolla-ansible-ubuntu-source
         - kolla-ansible-ubuntu-source-upgrade
     experimental:
       jobs:
-        - kolla-ansible-centos8s-source-swift-upgrade
         - kolla-ansible-ubuntu-source-swift-upgrade