Ensure that we inform all tasks to stop before starting the 60 seconds shutdown (#12897)

* Ensure that we inform all tasks to stop before starting the 60 seconds shutdown

The change of waiting in maximum 60 seconds for the node to shutdown actually introduced a bug. We
were actually waiting always 60 seconds as we didn't informed our tasks to shutdown. The solution to
this problem is to drop the task manager as this will then inform all tasks to end. It also adds
tests to ensure that the behaviors work as expected. (This should already have been done in the
first pr! :()

* ".git/.scripts/fmt.sh" 1

Co-authored-by: command-bot <>