Performance improvements for 40M posts (#7708)

* Optimizing get root posts SQL query

* Setting session invalidation to be reliable

* Adding app reciever to SessionHasPermissionToUser

* Adding app reciever to SessionHasPermissionToTeam

* Adding app reciever to SessionHasPermissionTo

* Clear session cache if permission was denied

* Fixing rebase issues

* Revert "Optimizing get root posts SQL query"

This reverts commit f364757e7015cfb4ec673d0a4fc3d57cd25d8dd7.

* Fixing build

app/session.go

@@ -124,7 +124,7 @@ func (a *App) ClearSessionCacheForUser(userId string) {
 	if a.Cluster != nil {
 		msg := &model.ClusterMessage{
 			Event:    model.CLUSTER_EVENT_CLEAR_SESSION_CACHE_FOR_USER,
-			SendType: model.CLUSTER_SEND_BEST_EFFORT,
+			SendType: model.CLUSTER_SEND_RELIABLE,
 			Data:     userId,
 		}
 		a.Cluster.SendClusterMessage(msg)