USER STORY: Conditionally show names of task assignee

[blahosyl]

As a Logged-in User,

I want to see the first and last name of task owner if available,

so that can see my teammates' name instead of their username

Acceptance Criteria

1. Owner field on task card displays first name, last name or both if available
2. Otherwise, it displays the username

Tasks

• add owner_firstname and owner_lastname to Task serializer in API (if not already added)
• add conditional logic to display name in Task.js in FE

[blahosyl]

add owner_firstname and owner_lastname to Task serializer in API