Remove uncles related code (#13216)

The code was added without any clear usage. The inherent for example is not benchmarked and not used.

substrate/bin/node/cli/src/service.rs

@@ -222,10 +222,7 @@ pub fn new_partial(
 					slot_duration,
 				);
 
-			let uncles =
-				sp_authorship::InherentDataProvider::<<Block as BlockT>::Header>::check_inherents();
-
-			Ok((slot, timestamp, uncles))
+			Ok((slot, timestamp))
 		},
 		&task_manager.spawn_essential_handle(),
 		config.prometheus_registry(),
@@ -440,11 +437,6 @@ pub fn new_full_base(
 			create_inherent_data_providers: move |parent, ()| {
 				let client_clone = client_clone.clone();
 				async move {
-					let uncles = sc_consensus_uncles::create_uncles_inherent_data_provider(
-						&*client_clone,
-						parent,
-					)?;
-
 					let timestamp = sp_timestamp::InherentDataProvider::from_system_time();
 
 					let slot =
@@ -459,7 +451,7 @@ pub fn new_full_base(
 							&parent,
 						)?;
 
-					Ok((slot, timestamp, uncles, storage_proof))
+					Ok((slot, timestamp, storage_proof))
 				}
 			},
 			force_authoring,