feat: move notifications origin resolving to backend

Signed-off-by: Heikki Hellgren <heikki.hellgren@op.fi>

plugins/notifications-common/api-report.md

@@ -27,7 +27,7 @@ export type NotificationPayload = {
   title: string;
   description?: string;
   link?: string;
-  severity: NotificationSeverity;
+  severity?: NotificationSeverity;
   topic?: string;
   scope?: string;
   icon?: string;

plugins/notifications-common/src/types.ts

@@ -24,7 +24,7 @@ export type NotificationPayload = {
   link?: string;
   // TODO: Add support for additional links
   // additionalLinks?: string[];
-  severity: NotificationSeverity;
+  severity?: NotificationSeverity;
   topic?: string;
   scope?: string;
   icon?: string;