Add notifications reminders link (#2667)

https://eaflood.atlassian.net/browse/WATER-4900

This change updates the notifications reminders link to redirect to the system notification setup journey.

The journey key is set to 'reminders' to match the expected query string.

src/internal/modules/manage/lib/manage-nav.js

@@ -31,8 +31,8 @@ const manageTabSkeleton = () => ({
   returnNotifications: [
     createLink('Invitations', _returnNotificationsInvitations(), scope.bulkReturnNotifications),
     createLink('Paper forms', '/returns-notifications/forms', scope.returns),
-    createLink('Reminders', '/returns-notifications/reminders', scope.bulkReturnNotifications),
-    createLink('Ad-hoc returns', '/system/notifications/setup?journey=ad-hoc', config.featureToggles.enableSystemNotifications && scope.returns)
+    createLink('Reminders', _returnNotificationsReminders(), scope.bulkReturnNotifications),
+    createLink('Ad-hoc', '/system/notifications/setup?journey=ad-hoc', config.featureToggles.enableSystemNotifications && scope.returns)
   ],
   licenceNotifications: [
     createLink('Renewal', 'notifications/2?start=1', scope.renewalNotifications)
@@ -75,4 +75,12 @@ const _returnNotificationsInvitations = () => {
   }
 }
 
+const _returnNotificationsReminders = () => {
+  if (config.featureToggles.enableSystemNotifications) {
+    return '/system/notifications/setup?journey=reminders'
+  } else {
+    return '/returns-notifications/reminders'
+  }
+}
+
 exports.getManageTabConfig = getManageTabConfig