Companion for Taskmanager: Remove clean_shutdown

paritytech/substrate#10314

node/test/service/tests/build-blocks.rs

@@ -52,7 +52,4 @@ async fn ensure_test_service_build_blocks() {
 			_ = t3 => panic!("service Bob failed"),
 		}
 	}
-
-	alice.task_manager.clean_shutdown().await;
-	bob.task_manager.clean_shutdown().await;
 }

node/test/service/tests/call-function.rs

@@ -35,6 +35,4 @@ async fn call_function_actually_work() {
 	let result = object.get("result");
 	let result = result.expect("key result exists");
 	assert_eq!(result.as_str().map(|x| x.starts_with("0x")), Some(true), "result starts with 0x");
-
-	alice.task_manager.clean_shutdown().await;
 }

parachain/test-parachains/adder/collator/tests/integration.rs

@@ -80,10 +80,4 @@ async fn collating_using_adder_collator() {
 
 	// Wait until the collator received `12` seconded statements for its collations.
 	collator.wait_for_seconded_collations(12).await;
-
-	join!(
-		alice.task_manager.clean_shutdown(),
-		bob.task_manager.clean_shutdown(),
-		charlie.task_manager.clean_shutdown(),
-	);
 }