Due date can be removed from milestones
What does this MR do?
Adds a button to milestone form to allow user to remove due date
What are the relevant issue numbers?
Closes #15063 (closed)
Do not update/delete: Banner broadcast message test data
Do not update/delete: Notification broadcast message test data
Adds a button to milestone form to allow user to remove due date
Closes #15063 (closed)