Visibly separating mandatory and voluntary custom questions

**Is your feature request related to a problem? Please describe.**
It is time consumable to see which custom questions are required and which are not. Not high priority

**Describe the solution you'd like**
On the side of every Custom question, eg. an asterisk describing the questions that are set as required questions

**Describe alternatives you've considered**

**Additional context**


Comienza localizando el formulario de preguntas personalizadas y el estado existente de las preguntas obligatorias en el frontend de JavaScript. Confirma cómo se renderizan las preguntas obligatorias y, después, verifica que las preguntas obligatorias y voluntarias se distingan visualmente en la interfaz.

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