Spec v1.7.0-alpha.6 and Gloas genesis (#9190)

Co-Authored-By: Josh King <josh@sigmaprime.io>

Co-Authored-By: Jimmy Chen <jchen.tc@gmail.com>

Co-Authored-By: Michael Sproul <michael@sigmaprime.io>

beacon_node/network/src/network_beacon_processor/tests.rs

@@ -2131,6 +2131,7 @@ fn make_test_payload_envelope(
             execution_requests: ExecutionRequests::default(),
             builder_index: 0,
             beacon_block_root,
+            parent_beacon_block_root: Hash256::ZERO,
         },
         signature: Signature::empty(),
     }