Fix Rust beta compiler errors (1.77) (#5180)

* Lint fixes

* More fixes for beta compiler.

* Format fixes

* Move `#[allow(dead_code)]` to field level.

* Remove old comment.

* Update beacon_node/execution_layer/src/test_utils/mod.rs

Co-authored-by: João Oliveira <hello@jxs.pt>

* remove duplicate line

beacon_node/http_api/src/attestation_performance.rs

@@ -14,11 +14,12 @@ const MAX_REQUEST_RANGE_EPOCHS: usize = 100;
 const BLOCK_ROOT_CHUNK_SIZE: usize = 100;
 
 #[derive(Debug)]
+// We don't use the inner values directly, but they're used in the Debug impl.
 enum AttestationPerformanceError {
-    BlockReplay(BlockReplayError),
-    BeaconState(BeaconStateError),
-    ParticipationCache(ParticipationCacheError),
-    UnableToFindValidator(usize),
+    BlockReplay(#[allow(dead_code)] BlockReplayError),
+    BeaconState(#[allow(dead_code)] BeaconStateError),
+    ParticipationCache(#[allow(dead_code)] ParticipationCacheError),
+    UnableToFindValidator(#[allow(dead_code)] usize),
 }
 
 impl From<BlockReplayError> for AttestationPerformanceError {