cli: introduce Unknown variant for NotificationKind
When the rad inbox command would come across a reference name that
it did not recognise as a Cob or Branch, then it would fail with
an Unknown error.
Instead, add an Unknown variant to NotificationKind which can be
displayed in the inbox CLI.
When the rad inbox command would come across a reference name that
it did not recognise as a Cob or Branch, then it would fail with
an Unknown error.
Instead, add an Unknown variant to NotificationKind which can be
displayed in the inbox CLI.
Changes:
- Hide unknown notifications behind
show-unknownflag
Rebase.