Inactive user shown in Time sheet (#6068)

1) Added property leaving date to employee.
2) Added leaving date to employee type.
3) Validation for comparing joining and leaving date
added to employee entity.
4) Added leaving date tool tip to show user form.
5) Function find employed users added to user repository.
6) Timesheet controller modified to use find employed
users to fetch users for the timesheet.
7) Show timesheet template modified to show an empty row
from the date when the user left.