XWIKI-20109: Notification headers for autoreplies

    Added common headers to notification emails to prevent autoresponses from various emails autoreply

(cherry picked from commit a9b3cde)

Co-Authored-By: Simon Urli <simon.urli@xwiki.com>
(cherry picked from commit d1b0438)

Author: the-glu

xwiki-platform-core/xwiki-platform-notifications/xwiki-platform-notifications-notifiers/xwiki-platform-notifications-notifiers-default/src/main/java/org/xwiki/notifications/notifiers/internal/email/AbstractMimeMessageIterator.java

@@ -426,6 +426,8 @@ public MimeMessage next()
             updateFactoryParameters(templateDocumentReference);
             message = ExtendedMimeMessage.wrap(this.factory.createMessage(templateDocumentReference,
                 this.factoryParameters));
+            message.setHeader("Auto-Submitted", "auto-generated");
+            message.setHeader("X-Auto-Response-Suppress", "All");
 
             List<EntityEvent> events = new ArrayList<>();
             this.currentEvents.forEach(