Resolve the security hotspots reported by sonarqube in the backend_mobile

[profotoce59]

Context

As a developer I want to keep my code clean In order to make the application easier to maintain and debug.

Expected Behavior

Sonarqube has reported some security hotspots. We need to fix them.

Acceptance criteria

Sonarqube won't show any security hotspots for the admin_backend server.

[profotoce59]

CORS issue