In case we still have work to do but the previous run ended too early and it still had some execution time left
we will not schedule new action.
This is prevention for creating a run action every one second in case there is e.g. some stuck job.
Next run will be triggered within the trigger action that runs every 2 minutes.
[MAILPOET-4684]
With the new unique parameter added in the action scheduler 3.5.0 the
as_schedule_single_action that schedules an immediate action
seems to be more convenient for the action scheduler.
We get better control over the scheduling of subsequent runs.
Note: We don't want to use the async action that is also executed immediately,
but it has the highest priority and we don't want to block actions scheduled by other plugins.
[MAILPOET-4684]
