Gate: Move Fedora job to experimental

This moves the Fedora job in openstack-helm-infra to an
experimental check until the issues with Fedora can be resolved

Change-Id: I5080351e3e12f2759b7fc9d73f361918d19041f6

.zuul.yaml

@@ -26,12 +26,6 @@
               - ^.*\.rst$
               - ^doc/.*$
               - ^releasenotes/.*$
-        - openstack-helm-infra-fedora:
-            voting: false
-            irrelevant-files:
-              - ^.*\.rst$
-              - ^doc/.*$
-              - ^releasenotes/.*$
         - openstack-helm-infra-dev-deploy:
             irrelevant-files:
               - ^.*\.rst$
@@ -65,6 +59,14 @@
               - ^.*\.rst$
               - ^doc/.*$
               - ^releasenotes/.*$
+    experimental:
+      jobs:
+        #NOTE(srwilkers): Make fedora job experimental until issues resolved
+        - openstack-helm-infra-fedora:
+            irrelevant-files:
+              - ^.*\.rst$
+              - ^doc/.*$
+              - ^releasenotes/.*$
 
 - nodeset:
     name: openstack-helm-single-node