Add in front end to only show valid or all curricular units when adding evaluation

[fapret]

Add a list on front to select if show all curricular units, curricular units the student can do or only the valid curricular unit ones when adding evaluations of a curricular unit.
For Faculty/Carrera/Plan/ucs api call just add "valid_flag" with any value to show only valid ones, if its undefined it shows all curricular units.
Examples: Show All - Show only valid
Using Faculty/Carrera/Plan/eval api call you can get the curricular units the student can do. It requires the next Body:

{ 
  faculty: string, 
  career: string, 
  plan: int || string, 
  file: xmi, 
  valid_flag: true 
}

Being file the student model. And valid_flag HAS to be true.