Bee Factory image upgrading path

[AuHau]

If the user does not purge the containers (eq using the --epheremal or the new --fresh flag) between launches of Bee Factory and then wants to upgrade to new versions of containers Bee Factory will error out as the container's image won't be as expected. For now, the workaround is to use the --fresh flag when updating image versions, which will purge the containers before the launch, but a better UX alternative would be to prompt the user for confirmation if the image should be purged and then continue with start-up of the cluster.