Marks matching notifications as dismissed. Provide exactly one of filter or notificationIds; notificationIds is capped at 100. Returns a registered NotificationBulkActionOperation. Small selections usually finish before the response and return Completed; otherwise the operation returns Processing and continues. Poll Location until terminal using the originating Person bearer, without an account header. An omitted filter limit selects all matches; an explicit limit bounds the selection. Non-dismissable notifications are skipped and reported in result.skipped.