Allow Supervisors to Delete Assessments from List

[eliasnebiyu]

• [ ] Add a "Delete" button to each assessment list row
• [ ] Implement the delete functionality in the front-end, API, and microservices
• [ ] Use bookshelf-soft-delete to "soft delete" records. This does NOT mean completely removing them from the database. A "soft delete" means flagging deleted records with a "deleted_at" datetime so that they can be filtered out by future database queries
• [ ] Update the assessment list to remove the correct row when a record is successfully deleted (without having to refresh the page)
• [ ] Modify the assessment list so that it only retrieves non-deleted assessments
• [ ] Modify the assessment list so that it is only accessible by authenticated Supervisors