ci: Remove upgrade testing stages from travis ci
ci: Remove upgrade testing stages from travis ci

Since upgrade testing jobs are being transitioned to
centos ci, there is no need run them here.

Signed-off-by: Yug <0bdbd163d0c315ea6160e8172ff8eceaf795a460@gmail.com>

ceph/ceph-csi,ceph/ceph-csi,ceph/ceph-csi,ceph/ceph-csi