mgr/dashboard: custom image for kcli bootstrap script

mgr/dashboard: custom image for kcli bootstrap script

the stable branches like quincy pulls from the quay.io/ceph/ceph:v17 to
bootstrap the ceph cluster in test environments. This will cause issues
because the branches are changing constantly but the image is not. So
using the quay.ceph.io repo to bring the cluster in test environment.

Signed-off-by: Nizamudeen A <nia@redhat.com>
(cherry picked from commit be8f1e7f4a81dbf04692446edcc429d93d59e09d)

 Conflicts:
	src/pybind/mgr/dashboard/ci/cephadm/bootstrap-cluster.sh
  - Reject the incoming changes and change the image tag to quincy