SL-13824 Remove notification when joining a group

indra/newview/llviewermessage.cpp

@@ -777,7 +777,6 @@ void response_group_invitation_coro(std::string url, LLUUID group_id, bool notif
             LL_DEBUGS("GroupInvite") << "Successfully sent response to group " << group_id << " invitation" << LL_ENDL;
             if (notify_and_update)
             {
-                LLNotificationsUtil::add("JoinGroupSuccess");
                 gAgent.sendAgentDataUpdateRequest();
 
                 LLGroupMgr::getInstance()->clearGroupData(group_id);

indra/newview/skins/default/xui/en/notifications.xml

@@ -1022,18 +1022,6 @@ The group no longer has open enrollment.
        yestext="OK"/>
   </notification>
 
-  <notification
-   icon="alertmodal.tga"
-   name="JoinGroupSuccess"
-   type="alertmodal">
-You have been added to the group
-    <tag>group_id</tag>
-    <tag>success</tag>
-    <usetemplate
-       name="okbutton"
-       yestext="OK"/>
-  </notification>
-  
   <notification
    icon="alertmodal.tga"
    name="JoinGroupInsufficientFunds"