MM-20225: Fix notification badge count for All Activity (#13353)

When push notification setting was selected to "All Activity", we were
just sending the unread count for the channel from where the message was sent
and not for all channels.

After discussion with @enahum and @migbot, we decided to keep the badge count
to only refer to mentions and not unread posts.

Therefore, we only take the unread count for the user irrespective of the
notify_props settings.

Updated the tests to reflect that.

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

app/notification_push.go

@@ -453,11 +453,11 @@ func (a *App) BuildPushNotificationMessage(contentsConfig string, post *model.Po
 		msg = a.buildFullPushNotificationMessage(contentsConfig, post, user, channel, channelName, senderName, explicitMention, channelWideMention, replyToThreadType)
 	}
 
-	badge, err := a.getPushNotificationBadge(user, channel)
+	unreadCount, err := a.Srv.Store.User().GetUnreadCount(user.Id)
 	if err != nil {
 		return nil, err
 	}
-	msg.Badge = badge
+	msg.Badge = int(unreadCount)
 
 	return msg, nil
 }
@@ -519,16 +519,3 @@ func (a *App) buildFullPushNotificationMessage(contentsConfig string, post *mode
 
 	return msg
 }
-
-func (a *App) getPushNotificationBadge(user *model.User, channel *model.Channel) (int, *model.AppError) {
-	var unreadCount int64
-	var err *model.AppError
-
-	if user.NotifyProps["push"] == "all" {
-		unreadCount, err = a.Srv.Store.User().GetAnyUnreadPostCountForChannel(user.Id, channel.Id)
-	} else {
-		unreadCount, err = a.Srv.Store.User().GetUnreadCount(user.Id)
-	}
-
-	return int(unreadCount), err
-}