MM-20347 Move ID Loaded Push Notifications to E20 (#13185)

* Move ID Loaded Push Notifications to E20

* Fix model tests

app/server.go

@@ -126,6 +126,7 @@ type Server struct {
 	Ldap             einterfaces.LdapInterface
 	MessageExport    einterfaces.MessageExportInterface
 	Metrics          einterfaces.MetricsInterface
+	Notification     einterfaces.NotificationInterface
 	Saml             einterfaces.SamlInterface
 }