View employees list in the scheduler per groups

User can group the employees by their location or department in the scheduler as below :

- When the User clicks on group by Department >> It will group employees by their departments.

- When the User clicks on group by Location >> It will group employees by their locations.

- When A group ( location or department ) doesn’t have employees in it >> this group collapsed list will not be shown.

- When A group ( location or department ) doesn’t have employees in it as a result of filtration >> this group collapsed list will not be shown.