Refine dashboard task list view sorting and UI

[daniel-wer]

Quote:

Therefore we would like to have only the task ID, project name and finish date per task. This should thin the list.
Now to the sorting. It would be nice if the tasks could be sorted after finished date, means the task on top is the task finished most recently

See https://discuss.webknossos.org/t/sorting-of-finished-tasks/1092

[daniel-wer]

From @fm3: The annotation belonging to a task has a modified field which could be used here.

[MichaelBuessemeyer]

@daniel-wer Shall I replace the list of finished tasks with a table? Because currently one item in the list only contains 4 "values" that can be put into a table nicely.