Only see divison members in assignee dropdown list

Make it possible to only have the names of people in a division be listed in the dropdown menu when assigning people to a task instead of the entire organization. If a division is significantly smaller than an organization, then we don’t need/want the huge list of random people.

@LEGGO you might be interested to join the discussion!

Correct, @Bastien_Siebman . I am. :wink: