Have yamllint allow templates without annotations

Annotations should only be required on kind: WorkflowTemplate and kind:
CronWorkflowTemplate, however the checker was already running on those
argo-events templates so I am leaving that in place.

.github/workflows/yamllint.yaml

@@ -48,7 +48,6 @@ jobs:
             workflows/argo-events/roles/*.y*ml
             workflows/argo-events/rolebindings/*.y*ml
             workflows/argo-events/workflowtemplates/*.y*ml
-            workflows/openstack/*.y*ml
 
   shellcheck:
     runs-on: ubuntu-latest