Zanzana: periodic sync of team members (#94752)

* Rewrite zanzana collector to fetch all available pages

* Register access control as a background service

* If zanzana is enabled we run Syncs and start Reconciliation job

* Update pkg/services/authz/zanzana/client/client.go

Co-authored-by: Alexander Zobnin <alexanderzobnin@gmail.com>

* Use server lock when doing performing reconciliation

pkg/services/accesscontrol/accesscontrol.go

@@ -36,6 +36,7 @@ type AccessControl interface {
 }
 
 type Service interface {
+	registry.BackgroundService
 	registry.ProvidesUsageStats
 	// GetRoleByName returns a role by name
 	GetRoleByName(ctx context.Context, orgID int64, roleName string) (*RoleDTO, error)