Update GET methods to return first name, last name and email address

[MCatherine1994]

Describe the task
Update get application admin, get delegated admin and get user role assignment methods to return user information with first name, last name and email address

Acceptance Criteria

• verify the return results included first/last/email (based on schema we expect this to be true))
• update tests

Additional context

• Add any other context about the task here.
• Or here