This introduces `NoTasksForService` and `NoTasks` poller checks, that
can be used to check if no tasks are left in general, or for a specific
service.
Some redundant checks were also removed from some tests.
Signed-off-by: Sebastiaan van Stijn <github@gone.nl>
(cherry picked from commit 56a68c15f8a093b1761e77a74d8b7acdfbcb30a2)
Signed-off-by: Sebastiaan van Stijn <github@gone.nl>
Upstream-commit: 8f6421457d3be6280236aa466e533fb32cb4509b
Component: engine