It would be nice to update the "disabled reason" field when evacuation fails (when using SMART_EVACUATE), so that it is easier to identify what happened.

We can set something like "evacuation: FAILED <timestamp>" or similar.

This would also allow us to be more restrictive with this filter https://github.com/openstack-k8s-operators/infra-operator/blob/main/templates/instanceha/bin/instanceha.py#L821 so we can exclude these computes from being re-targeted for evacuation but left alone for the operator to investigate.