Drop centos8-stream jobs

Change-Id: I37e84f270fbcbc92ea610c3ef90cfeca6dd28438

zuul.d/jobs.yaml

@@ -438,26 +438,6 @@
       dev_mode: false
       image_suffix: ""
 
-- job:
-    name: trove-centos8s-guest-image-build
-    run: playbooks/image-build/run.yaml
-    nodeset: trove-centos8s-single
-    timeout: 3600
-    description: |
-      Build Ubuntu jammy based image only on centos8 stream.
-    required-projects:
-      - openstack/diskimage-builder
-      - openstack/trove
-    files:
-      - ^integration/(scripts|tests)/
-    vars:
-      guest_os: ubuntu
-      guest_os_release: jammy
-      guest_username: ubuntu
-      branch: master
-      dev_mode: false
-      image_suffix: ""
-
 - job:
     name: publish-trove-guest-image-ubuntu-jammy
     parent: publish-trove-guest-image

zuul.d/nodesets.yaml

@@ -13,9 +13,3 @@
     nodes:
       - name: primary
         label: ubuntu-jammy
-
-- nodeset:
-    name: trove-centos8s-single
-    nodes:
-      - name: primary
-        label: centos-8-stream

zuul.d/projects.yaml

@@ -32,8 +32,6 @@
             voting: true
         - trove-ubuntu-guest-image-build:
             voting: true
-        - trove-centos8s-guest-image-build:
-            voting: true
     gate:
       jobs:
         - trove-tempest-ubuntu-base-mysql5.7