Returns the list of tasks referenced by active workflows of all applications in the account.

This lists gives an overview of all the tasks that are currently in use.
The returned tasks are distinct either by name, display_name or resource:

• display_name is the user defined name of the task
• name is a unique identifier for the task within a workflow
• resource is the type of the task (e.g "vat" for all VAT checks tasks), unique across workflows.