Cleanup consensus/types re-exports (#8643)

Removes some of the temporary re-exports in `consensus/types`.

I am doing this in multiple parts to keep each diff small.


Co-Authored-By: Mac L <mjladson@pm.me>

beacon_node/http_api/src/sync_committees.rs

@@ -17,8 +17,8 @@ use std::collections::HashMap;
 use tokio::sync::mpsc::UnboundedSender;
 use tracing::{debug, error, warn};
 use types::{
-    BeaconStateError, Epoch, EthSpec, SignedContributionAndProof, SyncCommitteeMessage, SyncDuty,
-    SyncSubnetId, slot_data::SlotData,
+    BeaconStateError, Epoch, EthSpec, SignedContributionAndProof, SlotData, SyncCommitteeMessage,
+    SyncDuty, SyncSubnetId,
 };
 
 /// The struct that is returned to the requesting HTTP client.