[BB-8760] feat: remove instructor after cloning
Description
This MR modifies the clone-course plugin, ensuring the API user isn't added as an instructor to the cloned course.
Testing instructions
- Install this branch on a devstack or sandbox.
- Clone an existing course.
- Ensure the course is cloned correctly.
- Ensure the course has no instructor/staff assigned.
Deadline
None
Edited by Paulo Viadanna