Companion for #8137 (MMR Custom RPC) (#2463)

* Switch branch

* Fix compilation.

* Revert "Switch branch"

This reverts commit a3bd3621.

* Update Cargo.lock.

* Add telemetry span back.

* Fix telemetry_span issues.

* Update substrate.

node/service/src/lib.rs

@@ -691,7 +691,7 @@ pub fn new_full<RuntimeApi, Executor>(
 
 	if config.offchain_worker.enabled {
 		let _ = service::build_offchain_workers(
-			&config, backend.clone(), task_manager.spawn_handle(), client.clone(), network.clone(),
+			&config, task_manager.spawn_handle(), client.clone(), network.clone(),
 		);
 	}
 
@@ -1009,7 +1009,6 @@ fn new_light<Runtime, Dispatch>(mut config: Configuration) -> Result<(
 	if config.offchain_worker.enabled {
 		let _ = service::build_offchain_workers(
 			&config,
-			backend.clone(),
 			task_manager.spawn_handle(),
 			client.clone(),
 			network.clone(),