FEAT: add isAdmin to login response
FEAT: add isAdmin to login response

UI should know if the logged in user needs to access the student
view or the instructor view

Signed-off-by: Gehad Elrobey <01cb2fd8767a6ff5989bccf7aeb0d14d7c3d0db3@gmail.com>

Jacob-Manuel/swe4103-group1,Jacob-Manuel/swe4103-group1