upgrade-snapshot.sh script works fine.

Updating the --watch and --debug functions to make it even easier to use.

--watch output

{{Upgrade started
CSV advanced-cluster-management.2.12.0 phase: Succeeded
=------{ Monitor for 360-720s5-10min }------=
 Elapsed:                    255s
 Multi-cluster hub phase:    Running
 Multi-cluster engine phase: Available}}

--debug just includes listing out the PODs for the engine or hub depending on what part of the install seems to be active.