R1:52f7446eeaa3

Remove "Create Empty Task" workflow callouts and some other clutter

Summary:
Ref T9908. This removes the "Create Another Empty Task", "Create A Similar Task" and "Create Another Subtask of Same Parent Task" workflow callouts on the task detail page, which are actions that show up after creating a task or creating a subtask.

- I think "Create Empty" isn't relevant now that we have "Create Task" nearby and the quick create menu?
- I'm not sure if "Create Similar" is worth keeping. If we do want to…