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/beacon/states.rs

@@ -12,9 +12,7 @@ use eth2::types::{
     ValidatorsRequestBody,
 };
 use std::sync::Arc;
-use types::{
-    AttestationShufflingId, CommitteeCache, Error as BeaconStateError, EthSpec, RelativeEpoch,
-};
+use types::{AttestationShufflingId, BeaconStateError, CommitteeCache, EthSpec, RelativeEpoch};
 use warp::filters::BoxedFilter;
 use warp::{Filter, Reply};
 use warp_utils::query::multi_key_query;