modify get_pending_balance_to_withdraw per gloas spec (#8302)

Author: shane-moore

consensus/types/src/beacon_state.rs

@@ -2456,15 +2456,41 @@ impl<E: EthSpec> BeaconState<E> {
             .map_err(Into::into)
     }
 
+    // TODO(EIP-7732): The consensus spec PR for this change mentions that some EF tests will be needed but haven't been created yet.
+    // We should integrate them once they are available.
+    // https://github.com/ethereum/consensus-specs/pull/4513
     pub fn get_pending_balance_to_withdraw(&self, validator_index: usize) -> Result<u64, Error> {
         let mut pending_balance = 0;
+
+        // Sum pending partial withdrawals
         for withdrawal in self
             .pending_partial_withdrawals()?
             .iter()
             .filter(|withdrawal| withdrawal.validator_index as usize == validator_index)
         {
             pending_balance.safe_add_assign(withdrawal.amount)?;
         }
+
+        // Sum builder pending withdrawals
+        if let Ok(builder_pending_withdrawals) = self.builder_pending_withdrawals() {
+            for withdrawal in builder_pending_withdrawals
+                .iter()
+                .filter(|withdrawal| withdrawal.builder_index as usize == validator_index)
+            {
+                pending_balance.safe_add_assign(withdrawal.amount)?;
+            }
+        }
+
+        // Sum builder pending payments
+        if let Ok(builder_pending_payments) = self.builder_pending_payments() {
+            for payment in builder_pending_payments
+                .iter()
+                .filter(|payment| payment.withdrawal.builder_index as usize == validator_index)
+            {
+                pending_balance.safe_add_assign(payment.withdrawal.amount)?;
+            }
+        }
+
         Ok(pending_balance)
     }