DEPRECATED 1244-b_024-optimal-template-journey-step-4-c-warning-leaving-the-set-up-page-modal

Wrote the unit test for full page component but for questionnaire editor it seems impossible as it has way too many dependencies. Hence nothing here was ever tested (I remember Andreas talking about this)

If you say it's not overly necessary to test the backAction, i'd save the spec file, that i started and delete it for this MR.

besides that it is working. I used the browser own prompting modal simply via confirm().

Closes #1244 (closed)