View Profile - Tasks : Action cannot be performed by keyboard alone

Steps to Reproduce

1. Open URL to the page
2. Navigate and activate "user profile" available in header section
3. Navigate to "Tasks" and activate it.
4. Navigate to "Assignee", "Due date", "Task appears on" available after "Description" section
5. Observe that "Assignee", "Due date", "Task appears on" buttons are missing keyboard support

 Screenshot

Actual Behaviour

When users tries to use sorting functionality sorting buttons such as "Assignee", "Due date", "Task appears on" are missing keyboard support hence, keyboard only user don't have access to sorting functionality.

Expected Result

When user tries to use sorting functionality , sorting buttons such as "Assignee", "Due date", "Task appears on" should have keyboard support. which would help keyboard only user to access sorting functionality.

Bug Ref: 725902