Add optional vendor_guid field to outcomes/groups in course copy
Add optional vendor_guid field to outcomes/groups in course copy

closes OUT-3626

flag=none

Test-plan:
- Export course content for a course
- Import that content and ensure it works as expected

Change-Id: I1fa90d6096421743f2529a7c294893cb39ab4167
Reviewed-on: https://gerrit.instructure.com/c/canvas-lms/+/235008
Tested-by: Service Cloud Jenkins <9144042a601061f88f1e1d7a1753ea3e2972119d@instructure.com>
Product-Review: Pat Renner <792d9ff02286b7420e6cc0794587e33424e05663@instructure.com>
Reviewed-by: Michael Brewer-Davis <785693f4c81267e5b88c0f98d39b56a39a2b6910@instructure.com>
QA-Review: Brian Watson <4411c2aac809443ec63e2dd517de0f2dbc7408c6@instructure.com>

instructure/canvas-lms,sfu/canvas-lms,sfu/canvas-lms,sfu/canvas-lms,instructure/canvas-lms,sfu/canvas-lms,sfu/canvas-lms,instructure/canvas-lms,instructure/canvas-lms,instructure/canvas-lms,sfu/canvas-lms,instructure/canvas-lms,sfu/canvas-lms,instructure/canvas-lms