Kubeflow enable checks deadlock

[ktsakalozos]

We have two checks for checking the status of kubeflow, the ambassador operator [1] and the uk8s model [2]. If the uk8s model exists but the operator is not running the use addon can neither be enabled nor disabled.

A way to reproduce this is:

sudo microk8s enable kubeflow
sudo microk8s kubectl delete ns kubeflow

[1] https://github.com/ubuntu/microk8s/blob/master/microk8s-resources/wrappers/addon-lists.yaml#L143
[2] https://github.com/ubuntu/microk8s/blob/master/microk8s-resources/actions/enable.kubeflow.sh#L183

[stale]

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