* Include queue extra config in `task_router`

We now want to have queue-specific config for enterprise-queues.
To get that specific config we need the task name, but it should only be applied if using enterprise-queue.

So a natural way to put it is when we get the queue for a task, we also get any extra config for it.

Putting this in `shared` to make sure it's consistent across `worker` and `api`.