Remove all code related to sentry nodes (#8079)

* Remove all code related to sentry nodes

* More fixing

substrate/client/service/src/lib.rs

@@ -309,7 +309,6 @@ async fn build_network_future<
 							Role::Authority { .. } => NodeRole::Authority,
 							Role::Light => NodeRole::LightClient,
 							Role::Full => NodeRole::Full,
-							Role::Sentry { .. } => NodeRole::Sentry,
 						};
 
 						let _ = sender.send(vec![node_role]);

substrate/client/service/src/metrics.rs

@@ -135,7 +135,6 @@ impl MetricsService {
 		let role_bits = match config.role {
 			Role::Full => 1u64,
 			Role::Light => 2u64,
-			Role::Sentry { .. } => 3u64,
 			Role::Authority { .. } => 4u64,
 		};