[MultiKueue] Report ClusterQueue as inactive (misconfigured) if not applied to all flavors

[mimowo]

What would you like to be added:

Fail validation for ClusterQueue in case the MultiKueue admission check is configured only for a subset of flavors.
This can be now done with a similar mechanism to this: #1913.

Why is this needed:

The managedBy field is immutable, so we cannot change it per flavor.
To fail fast and avoid debugging of customer issues when using MultiKueue for a subset of flavors.

Proposed approach

A mechanism similar to this one: #1635

[mimowo]

/assign @trasc
/cc @alculquicondor

[IrvingMg]

/assign

[alculquicondor]

as a clarification: an admission check applies to all flavors if the list in onFlavors is empty.