Filter out BlsToExecutionChange messages for 0x02 validators (#6464)

* Filter out 0x02 validators from `get_bls_to_execution_changes`

* Prune bls to execution changes that have a 0x02 credential

* lint

Author: pawanjay176

beacon_node/operation_pool/src/bls_to_execution_changes.rs

@@ -113,7 +113,7 @@ impl<E: EthSpec> BlsToExecutionChanges<E> {
                 .validators()
                 .get(validator_index as usize)
                 .map_or(true, |validator| {
-                    let prune = validator.has_eth1_withdrawal_credential(spec)
+                    let prune = validator.has_execution_withdrawal_credential(spec)
                         && head_block
                             .message()
                             .body()

beacon_node/operation_pool/src/lib.rs

@@ -585,7 +585,7 @@ impl<E: EthSpec> OperationPool<E> {
                     && state
                         .get_validator(address_change.as_inner().message.validator_index as usize)
                         .map_or(false, |validator| {
-                            !validator.has_eth1_withdrawal_credential(spec)
+                            !validator.has_execution_withdrawal_credential(spec)
                         })
             },
             |address_change| address_change.as_inner().clone(),