feat: course unenroll is configureable and its slot is added#738

marslanabdulrauf wants to merge 2 commits intoopenedx:masteropenedx/frontend-app-learner-dashboard:masterfrom

mitodl:marslan/4657-course-unenroll-reason-slotmitodl/frontend-app-learner-dashboard:marslan/4657-course-unenroll-reason-slotCopy head branch name to clipboard