Drop wheel publishing for centos-8-stream

centos-8-stream is EOL and the upstream repos have been cleaned, thus
the periodic build jobs are failing and we should drop then.

Actually cleaning up the related AFS volume should be done later, when
all other centos-8 jobs have been deleted.

Change-Id: I7c9bc3fcb5aa178c5af44da8a47eb882598c6c3e

zuul.d/jobs.yaml

@@ -852,48 +852,6 @@
       - name: afs
         secret: afsadmin_keytab
 
-- job:
-    name: publish-wheel-cache-centos-8-stream
-    description: |
-      Publish CentOS Stream 8 wheels for OpenStack CI mirrors.
-    parent: build-wheel-cache-centos-8-stream
-    pre-run: playbooks/openafs-client/setup.yaml
-    post-run: playbooks/publish/wheel-mirror.yaml
-    allowed-projects:
-      - openstack/requirements
-    final: true
-    secrets:
-      - name: afs
-        secret: wheel_keytab
-
-- job:
-    name: release-wheel-cache-centos-8-stream
-    parent: release-wheel-cache
-    final: true
-    vars:
-      wheel_volume: 'mirror.wheel.cent8sx64'
-
-- job:
-    name: publish-wheel-cache-centos-8-stream-arm64
-    description: |
-      Publish CentOS Stream 8 wheels for OpenStack CI mirrors.
-    parent: build-wheel-cache-centos-8-stream-arm64
-    pre-run: playbooks/openafs-client/setup.yaml
-    post-run: playbooks/publish/wheel-mirror.yaml
-    allowed-projects:
-      - openstack/requirements
-    final: true
-    secrets:
-      - name: afs
-        secret: wheel_keytab
-
-- job:
-    name: release-wheel-cache-centos-8-stream-arm64
-    parent: release-wheel-cache
-    final: true
-    vars:
-      wheel_volume: 'mirror.wheel.cent8sa64'
-
 - job:
     name: publish-wheel-cache-centos-9-stream
     description: |

zuul.d/projects.yaml

@@ -4099,10 +4099,6 @@
             branches: master
     periodic:
       jobs:
-        - publish-wheel-cache-centos-8-stream
-        - release-wheel-cache-centos-8-stream:
-            dependencies:
-              - name: publish-wheel-cache-centos-8-stream
         - publish-wheel-cache-centos-9-stream
         - release-wheel-cache-centos-9-stream:
             dependencies:
@@ -4123,10 +4119,6 @@
         - release-wheel-cache-ubuntu-bionic:
             dependencies:
               - name: publish-wheel-cache-ubuntu-bionic
-        - publish-wheel-cache-centos-8-stream-arm64
-        - release-wheel-cache-centos-8-stream-arm64:
-            dependencies:
-              - name: publish-wheel-cache-centos-8-stream-arm64
         - publish-wheel-cache-centos-9-stream-arm64
         - release-wheel-cache-centos-9-stream-arm64:
             dependencies: