revisit addCluster and related things

[qbalukom]

Analyze if it's possible to change how components/Clusters/shared works - possibly move some of them to a hook. For example addCluster, as it should most probably be using setAuth instead of calling that in components/Clusters/views/EditCluster/EditCluster.js or components/Clusters/components/AddClusterWizard.js.

This might alleviate the need for passing ClusterInfo, etc.