MM 17466 : Add custom post types to compliance exports (#13149)

Automatic Merge

templates/globalrelay_compliance_export_message.html

@@ -2,6 +2,7 @@
 <li class="message">
     <span class="sent_time">{{.Props.SentTime}}</span>
     <span class="username">@{{.Props.Username}}</span>
+    <span class="postusername">{{.Props.PostUsername}}</span>
     <span class="usertype">{{.Props.UserType}}</span>
     <span class="email">({{.Props.Email}}):</span>
     <span class="message">{{.Props.Message}}</span>