nuxeo-workflow-analytics should fetch worfklows from repository instead of hard-code

Currently `nuxeo-workflow-analytics` has hard-coded values for the `workflows` property. In addition, the property binding doesn't seem to work (i.e. binding an array to the `nuxeo-workflow-analytics` doesn't update the Select). But this shouldn't be necessary anyway as it's possible to get all workflow definitions using a query:

Select * from DocumentRoute where ecm:currentLifeCycleState = 'validated'

I'm setting this to Major because it's a bad impression for prospects to see this dashboard with only hard-coded values especially when we can fetch the worfklows.

(I realize that the platform does not properly return the name property of the workflow so I am linking this issue to one that requests that change)