Bug fixes and refactors to sysadmin dashboard#1921

ichuang merged 2 commits intoopenedx:feature/ichuang/sysadmin-dashboard-mongookopenedx/openedx-platform:feature/ichuang/sysadmin-dashboard-mongookfrom

carsongee:feature/cg/sysadmin-dashboard-mongookcarsongee/edx-platform:feature/cg/sysadmin-dashboard-mongookCopy head branch name to clipboard