Adjust ticket serializers must return fields as read-only if user lacks access

[jon-nfc]

Ticket permissions are custom and are at the field level.

Details

Based off of a users permissions mark fields as read-only if they lack the required permission for the field. This is required for the UI to make the required changes so as not to present the user with UI features they are denied permission from accessing.

note: users are already denied access from editing a field they dont have access to.

Tasks

• Make serializer fields read-only if the user has no access to it.
• Test