Combined removal of a static reservation and its active lease, needed by
NetOrk's VM-deletion cleanup flow. Reservation deletion follows the same
search-then-del<X>/{uuid} + reconfigure pattern as create_dhcp_reservation
and raises on failure; lease deletion is best-effort/non-fatal since the
Kea lease-delete endpoint shape is unverified against a real box.
Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>