umb-notifications.html - added option for setting the target attribute (#8224)

(cherry picked from commit 5642e56dd7)

src/Umbraco.Web.UI.Client/src/common/services/notifications.service.js

@@ -52,6 +52,7 @@ angular.module('umbraco.services')
 		* @param {String} item.message longer text for the notication, trimmed after 200 characters, which can then be exanded
 		* @param {String} item.type Notification type, can be: "success","warning","error" or "info" 
 		* @param {String} item.url url to open when notification is clicked
+		* @param {String} item.target the target used together with `url`. Empty if not specified.
 		* @param {String} item.view path to custom view to load into the notification box
 		* @param {Array} item.actions Collection of button actions to append (label, func, cssClass)
 		* @param {Boolean} item.sticky if set to true, the notification will not auto-close

src/Umbraco.Web.UI.Client/src/views/components/notifications/umb-notifications.html

@@ -9,7 +9,7 @@
             </div>
 
             <div ng-if="notification.headline">
-                <a ng-if="notification.url" ng-href="{{notification.url}}" href="" target="_blank">
+                <a ng-if="notification.url" ng-href="{{notification.url}}" href="" target="{{notification.target}}" rel="noreferrer">
                     <strong ng-bind="notification.headline"></strong>
                     <span ng-bind-html="notification.message"></span>
                 </a>