[UserRegistration] Take into account email confirmation in user registration process

[MateuszNaKodach]

Blockers

• None!

Subtasks

• registerUser in user-registration/domain/registerUser.ts should now return only UserRegistrationWasStarted. Fix tests.
• Add command CompleteUserRegistration.
• Add new domain function completeUserRegistration.ts, which will return UserRegistrationWasCompleted for started registration.
• Create command handler for CompleteUserRegistration.
• Create automation slice WhenEmailConfirmationWasApprovedThenCompleteUserRegistration. Execute CompleteUserRegistration when EmailConfirmationWasApproved (confirmationFor must have value user-registration).

Event Modeling
MIRO: https://miro.com/app/board/o9J_lQvnN28=/?moveToWidget=3074457363395418540&cot=14

Need help how to implement automation?
Look for this task implementation: #282

[github-actions]

Branch issue-318-_UserRegistration_Take_into_account_email_confirmation_in_user_registration_process created!