Closes SOS-1917
flag=none
Test plan:
- import a csv with declared_user_type provided
- verify that the user has declared_user_type set
- import a csv with declared_user_type not provided
- verify that the user still has declared_user_type set previously
- import a csv with declared_user_type=<delete>
- verify that user's declared_user_type is unset
Change-Id: I9a26247b20f65cdb96a5a84e0eb53dd29f391467
Reviewed-on: https://gerrit.instructure.com/c/canvas-lms/+/275475
Tested-by: Service Cloud Jenkins <svc.cloudjenkins@instructure.com>
Reviewed-by: Rob Orton <rob@instructure.com>
QA-Review: Kozma Jozsef <jkozma@instructure.com>
Product-Review: Kozma Jozsef <jkozma@instructure.com>