Remove bionic/focal arm64 wheel jobs

There are no consumers of this architecture now (except these jobs)
so remove them so we can remove the nodepool config.

Change-Id: I7a557026728e5ac458ae8780043992a54ae6d87e

zuul.d/jobs.yaml

@@ -956,27 +956,6 @@
     vars:
       wheel_volume: 'mirror.wheel.focalx64'
 
-- job:
-    name: publish-wheel-cache-ubuntu-focal-arm64
-    parent: build-wheel-cache-ubuntu-focal-arm64
-    description: |
-      Publish Ubuntu Focal wheels for OpenStack CI mirrors.
-    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-ubuntu-focal-arm64
-    parent: release-wheel-cache
-    final: true
-    vars:
-      wheel_volume: 'mirror.wheel.focala64'
-
 - job:
     name: publish-wheel-cache-ubuntu-bionic
     parent: build-wheel-cache-ubuntu-bionic
@@ -998,27 +977,6 @@
     vars:
       wheel_volume: 'mirror.wheel.bionicx64'
 
-- job:
-    name: publish-wheel-cache-ubuntu-bionic-arm64
-    parent: build-wheel-cache-ubuntu-bionic-arm64
-    description: |
-      Publish Ubuntu Bionic wheels for OpenStack CI mirrors.
-    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-ubuntu-bionic-arm64
-    parent: release-wheel-cache
-    final: true
-    vars:
-      wheel_volume: 'mirror.wheel.bionica64'
-
 - job:
     name: check-release-approval
     description: |

zuul.d/projects.yaml

@@ -4169,18 +4169,6 @@
             branches: master
             dependencies:
               - name: publish-wheel-cache-ubuntu-jammy-arm64
-        - publish-wheel-cache-ubuntu-focal-arm64:
-            branches: master
-        - release-wheel-cache-ubuntu-focal-arm64:
-            branches: master
-            dependencies:
-              - name: publish-wheel-cache-ubuntu-focal-arm64
-        - publish-wheel-cache-ubuntu-bionic-arm64:
-            branches: master
-        - release-wheel-cache-ubuntu-bionic-arm64:
-            branches: master
-            dependencies:
-              - name: publish-wheel-cache-ubuntu-bionic-arm64
     periodic-weekly:
       jobs:
         - propose-updates: