Remove 'eo' artifacts when doing common/lib test runs
Merge pull request #6012 from edx/sarina/remove-eo-artifacts

Remove 'eo' artifacts when doing test runs
Rename legacy dash template
Remove Grade Adjustment code from legacy dash
Clean up Grade Downloads section of legacy dash
Clean up Admin section of legacy dashboard
Clean up Forum Admin section of legacy dashboard
Clean up Email section of legacy dashboard
Add CSS rules for legacy dash deprecation warnings
Clean up Manage Groups section on legacy dashboard
Remove deprecated cohorts management on legacy dashboard
Clean up Datadump section on legacy dashboard