feat(fi): add unseal_by_receiver_only 40326

[kampiliira]

No description provided.

[k-patrik]

Hey there! Fine by me but I wonder if it isn't time to split this repo? Since the business logic has converged that much; we don't have any seal/unseal requirement in Swedish inboxes as far as I know.

[k-patrik]

Approving to unblocking

[kampiliira]

Thanks @k-patrik. There are at least two repos that shouldn't be split, in my opinion: kivra-api-errors and event_schemas. This is because ours apps still share code heavily with Sweden, so it will be wise to keep the error codes and certain schemas aligned. For example, if the kivra-api-errors repo were to diverge and Sweden decides to take 40326 to mean a different error, it will be very difficult for the apps to keep track the differences. It will be best for the same error code to mean the same thing, everywhere, across different markets.