Allow of viewing coach reports for only ungrouped users
Show "Ungrouped" option for the list of groups on coach reports.
Some refactor to make `has_ungrouped_students` reusable.
Remove option for "All" and "Ungrouped" from handlebars and put it on the API endpoint with flag if to include it on returned objects or not.
Initial changes to reuse the UNGROUPED_KEY.
all navigation for all facility and all ungroup facility user. Navigation can also navigate by facility user under a facility