The Task Tab should show SCHEDULED tasks

[ehiggs]

Is your feature request related to a problem? Please describe. As an admin with backed up queues I would like SCHEDULED tasks on the Task page so that I can see more easily where a spike in work came from.

Currently we only show tasks with an actual Celery state - and SCHEDULED or QUEUED is not one of these.

Describe the solution you'd like As an admin with backed up queues I would like SCHEDULED tasks on the Task page so that I can see more easily where a spike in work came from.

Alternatively make worker/<worker-id>#tab-tasks work from a json API that is rendered so we can make our own tooling with the API.