Checks that we collect obsolete async tasks with async stacks.
Async stacks count: 1
Scheduled async tasks: 1
Recurring async tasks: 0

Async stacks count: 0
Scheduled async tasks: 0
Recurring async tasks: 0

Async stacks count: 2
Scheduled async tasks: 2
Recurring async tasks: 0

Async stacks count: 0
Scheduled async tasks: 0
Recurring async tasks: 0

Async stacks count: 1
Scheduled async tasks: 1
Recurring async tasks: 0

Async stacks count: 0
Scheduled async tasks: 0
Recurring async tasks: 0