Silence some alerts due to overly verbose warnings. (#3946)

* statement-distribution: Only warn on relevant stuff.

* Silence warnings in availability-distribution.

* Demote more warnings.

* More consistency.

* info -> debug

polkadot/node/network/availability-distribution/src/requester/fetch_task/mod.rs

@@ -344,7 +344,7 @@ impl RunningTask {
 				Err(TaskError::PeerError)
 			},
 			Err(RequestError::NetworkError(err)) => {
-				tracing::warn!(
+				tracing::debug!(
 					target: LOG_TARGET,
 					origin= ?validator,
 					err= ?err,
@@ -353,7 +353,7 @@ impl RunningTask {
 				Err(TaskError::PeerError)
 			},
 			Err(RequestError::Canceled(oneshot::Canceled)) => {
-				tracing::warn!(target: LOG_TARGET,
+				tracing::debug!(target: LOG_TARGET,
 							   origin= ?validator,
 							   "Erasure chunk request got canceled");
 				Err(TaskError::PeerError)