Connect "Confirm Arrival" button with the backend

Description: When the "Confirm Arrival" button is clicked the app should let the the backend now so that is can track the event and maybe show the information to the FM.

Acceptance criteria:

[x] Call the endpoint provided by the API to basically track the event
[x] Handle authentication error if existent

TU-CP18 / cp18-app

Connect "Confirm Arrival" button with the backend #47