Respect send push proxy notification configuration on test notifications (#20063)

* Respect send push proxy notification configuration on test notifications

* Unify notifications check

Co-authored-by: Mattermod <mattermod@users.noreply.github.com>

app/notification_push.go

@@ -578,6 +578,10 @@ func (a *App) BuildPushNotificationMessage(contentsConfig string, post *model.Po
 }
 
 func (a *App) SendTestPushNotification(deviceID string) string {
+	if !a.canSendPushNotifications() {
+		return "false"
+	}
+
 	msg := &model.PushNotification{
 		Version:  "2",
 		Type:     model.PushTypeTest,