Feature: A citizen can unsubscribe from an initiative
- A citizen onboard tries to unsubscribe and receives OK
- An unsubscribed citizen tries to unsubscribe again and receives OK
- An unsubscribed citizen tries to onboard and fails
- An unsubscribed citizen tries to authorize a transaction
- An unsubscribed citizen tries to onboard another initiative
- The transaction made before unsubscribing is present in the rewards file
- A suspended citizen can unsubscribe