Future adhoc tasks should be listed in Scheduled Tasks page

Currently Scheduled Tasks page only show recurring tasks. There is no way to visually list the future adhoc tasks. We have to query DB to check if an adhoc task has been scheduled. Also in case if for some reason we have to manage a future adhoc task like canceling it or extending its time then it will become cumbersome.

Idea discussed in the matrix was to make future adhoc task also appear in same Scheduled Tasks page with indication of adhoc and other scheduled tasks with recurring. Multiple instances of future adhoc task should appear as a count similar to plugin instances, when clicked will show all instances.

Tasks running now page should also list currently executing adhoc task with indication of adhoc or recurring.