Remove converted cl-openstack-client job
The job is in-tree now, remove it.
name: openstack/cl-openstack-client
templates:
- system-required
- check:
- jobs:
- - legacy-cl-openstack-client-run-tests
- gate:
- jobs:
- - legacy-cl-openstack-client-run-tests
- project:
name: openstack/cliff
