Prompt users to activate a workspace in the content workflow instead of just denying access to some page

Implemented this feature using a route enhancer instead, because that gives us access to the entity bundle.

Also moved the whole thing to entity_workflow_content since that's the workflow which requires an active workspace for entity operations.

Committed the patch above :)

amateescu → closed merge request !1

Automatically closed - issue fixed for 2 weeks with no activity.