CI: drop all CentOS Stream 8 jobs

As in Kolla - we can not support CS8 anymore due to Python 3.8+
requirement.

Change-Id: Id5567fdedf52e8808400c181e90243fee7f3e136

zuul.d/project.yaml

@@ -11,66 +11,66 @@
       - periodic-stable-jobs
     check:
       jobs:
-        - kolla-ansible-centos8s-source
+        # # - kolla-ansible-centos8s-source
         - kolla-ansible-debian-source
         - kolla-ansible-openeuler-source
         - kolla-ansible-rocky8-source
         - kolla-ansible-ubuntu-source
-        - kolla-ansible-centos8s-source-kvm
+        # - kolla-ansible-centos8s-source-kvm
         - kolla-ansible-ubuntu-source-kvm
-        - kolla-ansible-centos8s-source-multinode-ipv6
+        # - kolla-ansible-centos8s-source-multinode-ipv6
         - kolla-ansible-ubuntu-source-multinode-ipv6
-        - kolla-ansible-centos8s-source-bifrost
+        # - kolla-ansible-centos8s-source-bifrost
         - kolla-ansible-ubuntu-source-bifrost
-        - kolla-ansible-centos8s-source-zun
+        # - kolla-ansible-centos8s-source-zun
         - kolla-ansible-debian-source-zun
         - kolla-ansible-ubuntu-source-zun
-        - kolla-ansible-centos8s-source-swift
+        # - kolla-ansible-centos8s-source-swift
         - kolla-ansible-ubuntu-source-swift
-        - kolla-ansible-centos8s-source-scenario-nfv
+        # - kolla-ansible-centos8s-source-scenario-nfv
-        - kolla-ansible-centos8s-source-magnum
+        # - kolla-ansible-centos8s-source-magnum
         - kolla-ansible-ubuntu-source-magnum
-        - kolla-ansible-centos8s-source-octavia
+        # - kolla-ansible-centos8s-source-octavia
         - kolla-ansible-ubuntu-source-octavia
-        - kolla-ansible-centos8s-source-masakari
+        # - kolla-ansible-centos8s-source-masakari
         - kolla-ansible-ubuntu-source-masakari
-        - kolla-ansible-centos8s-source-ironic
+        # - kolla-ansible-centos8s-source-ironic
         - kolla-ansible-debian-source-ironic
         - kolla-ansible-ubuntu-source-ironic
-        - kolla-ansible-centos8s-source-upgrade
+        # - kolla-ansible-centos8s-source-upgrade
         - kolla-ansible-debian-source-upgrade
         - kolla-ansible-ubuntu-source-upgrade
         - kolla-ansible-ubuntu-binary-upgrade
-        - kolla-ansible-centos8s-source-cells
+        # - kolla-ansible-centos8s-source-cells
-        - kolla-ansible-centos8s-source-mariadb
+        # - kolla-ansible-centos8s-source-mariadb
         - kolla-ansible-ubuntu-source-mariadb
-        - kolla-ansible-centos8s-source-linuxbridge
+        # - kolla-ansible-centos8s-source-linuxbridge
         - kolla-ansible-ubuntu-source-linuxbridge
-        - kolla-ansible-centos8s-source-ovn
+        # - kolla-ansible-centos8s-source-ovn
         - kolla-ansible-ubuntu-source-ovn
-        - kolla-ansible-centos8s-source-prometheus-efk
+        # - kolla-ansible-centos8s-source-prometheus-efk
         - kolla-ansible-ubuntu-source-prometheus-efk
-        - kolla-ansible-centos8s-source-venus
+        # - kolla-ansible-centos8s-source-venus
         - kolla-ansible-ubuntu-source-venus
-        - kolla-ansible-centos8s-source-monasca
+        # - kolla-ansible-centos8s-source-monasca
-        - kolla-ansible-centos8s-source-cephadm
+        # - kolla-ansible-centos8s-source-cephadm
         - kolla-ansible-ubuntu-source-cephadm
-        - kolla-ansible-centos8s-source-upgrade-cephadm
+        # - kolla-ansible-centos8s-source-upgrade-cephadm
         - kolla-ansible-ubuntu-source-upgrade-cephadm
-        - kolla-ansible-centos8s-hashi-vault
+        # - kolla-ansible-centos8s-hashi-vault
     check-arm64:
       jobs:
         - kolla-ansible-debian-source-aarch64
         - kolla-ansible-debian-source-upgrade-aarch64
     gate:
       jobs:
-        - kolla-ansible-centos8s-source
+        # - kolla-ansible-centos8s-source
-        - kolla-ansible-centos8s-source-upgrade
+        # - 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-centos8s-source-swift-upgrade
         - kolla-ansible-ubuntu-source-swift-upgrade