Drop Fedora support

We are about to drop Fedora support as the latest image in upstream
has been transitioned to EOL. Centos 9 Stream has evolved as
replacement platform for new features. Patch which removes fedora
jobs and nodeset from devstack:
https://review.opendev.org/c/openstack/devstack/+/885467

This is needed for https://review.opendev.org/c/openstack/devstack/+/925837

Change-Id: Ib7d3dd93602c94fd801f8fe5daa26353b04f589b
(cherry picked from commit 86c542c)
(cherry picked from commit fde9368)

Author: jakubskunda

.zuul.yaml

@@ -752,10 +752,6 @@
             irrelevant-files: *nova-base-irrelevant-files
         - os-vif-ovs:
             irrelevant-files: *nova-base-irrelevant-files
-        - devstack-platform-fedora-latest:
-            irrelevant-files: *nova-base-irrelevant-files
-        - devstack-platform-fedora-latest-virt-preview:
-            irrelevant-files: *nova-base-irrelevant-files
         - devstack-plugin-ceph-compute-local-ephemeral:
             irrelevant-files: *nova-base-irrelevant-files
         - devstack-tobiko-nova: