Implement Self-CheckIn (EXPOSUREAPP-5747) (#2757)

* Create self-checkin event

* navigation to check-in

* Prevent multiple self-check-ins

* Fix merge

* Update layout

* Allow check-in multiple times

* fix lint

* Update test menu

* Force onboarding before check-in by deeplink

* fix typos

Co-authored-by: Lukas Lechner <lukas.lechner@sap.com>
Co-authored-by: harambasicluka <64483219+harambasicluka@users.noreply.github.com>
Co-authored-by: I502720 <axel.herbstreith@sap.com>