Function to delete enqueued tasks should be added

Current Situation

The task queue of a job is only a list of enqueued tasks without any function.

Desired Behavior

It should be possible to delete one or more tasks of the task queue.

• The delete function should be callable corresponding to other bulk operations such as "Start Task now".
• This function is only available if the user has the "job.kill" permission

If the user has sufficient permissions then

• A first column with checkboxes should be added.
• The header field of this column contains a checkbox to select or unselect all tasks.
• If a task is selected then a Delete button should be displayed.
• The Delete button opens a dialog for auditlog reasons if necessary
• The Delete button calls the API ./tasks/kill