Use milhouse pop_front

Author: pawanjay176

consensus/state_processing/src/per_block_processing.rs

@@ -644,13 +644,9 @@ pub fn process_withdrawals<E: EthSpec, Payload: AbstractExecPayload<E>>(
 
         // Update pending partial withdrawals [New in Electra:EIP7251]
         if let Some(processed_partial_withdrawals_count) = processed_partial_withdrawals_count {
-            // TODO(electra): Use efficient pop_front after milhouse release https://github.com/sigp/milhouse/pull/38
-            let new_partial_withdrawals = state
-                .pending_partial_withdrawals()?
-                .iter_from(processed_partial_withdrawals_count)?
-                .cloned()
-                .collect::<Vec<_>>();
-            *state.pending_partial_withdrawals_mut()? = List::new(new_partial_withdrawals)?;
+            state
+                .pending_partial_withdrawals_mut()?
+                .pop_front(processed_partial_withdrawals_count)?;
         }
 
         // Update the next withdrawal index if this block contained withdrawals

consensus/state_processing/src/per_epoch_processing/single_pass.rs

@@ -1075,13 +1075,9 @@ fn process_pending_consolidations<E: EthSpec>(
         next_pending_consolidation.safe_add_assign(1)?;
     }
 
-    let new_pending_consolidations = List::try_from_iter(
-        state
-            .pending_consolidations()?
-            .iter_from(next_pending_consolidation)?
-            .cloned(),
-    )?;
-    *state.pending_consolidations_mut()? = new_pending_consolidations;
+    state
+        .pending_consolidations_mut()?
+        .pop_front(next_pending_consolidation)?;
 
     // the spec tests require we don't perform effective balance updates when testing pending_consolidations
     if !perform_effective_balance_updates {