let sylva-units-status capture the fact that the upgrade from 1.1.1 is done

In the future we'll want to distinguish case where we just cycle sylva-units from case where we upgrade from the last stable, to know what "transition units" need to be enabled. Today we can't do this because _internal.is_upgrade is true in both cases.

This MR adds a simple annotation to the sylva-units-status ConfigMap (this CM is produced at the end of an apply) to mark the fact that the upgrade from 1.1.1 is behind us.

We won't try to make use of this in Sylva 1.2.0, but we might leverage this flag in some 1.2.x patch release to disable transition units that aren't useful to enable after the transition.

/cc @feleouet