Rework telemetry to replace the use of tracing with an object we pass around (#8143)

polkadot companion: paritytech/polkadot#2535

substrate/client/consensus/babe/src/tests.rs

@@ -320,6 +320,7 @@ impl TestNetFactory for BabeTestNet {
 				epoch_changes: data.link.epoch_changes.clone(),
 				time_source: data.link.time_source.clone(),
 				can_author_with: AlwaysCanAuthor,
+				telemetry: None,
 			},
 			mutator: MUTATOR.with(|m| m.borrow().clone()),
 		}
@@ -432,6 +433,7 @@ fn run_one_test(
 			keystore,
 			can_author_with: sp_consensus::AlwaysCanAuthor,
 			block_proposal_slot_portion: SlotProportion::new(0.5),
+			telemetry: None,
 		}).expect("Starts babe"));
 	}
 	futures::executor::block_on(future::select(