Misc changes for merge testnets (#2667)

* Thread eth1_block_hash into interop genesis state

* Add merge-fork-epoch flag

* Build LH with minimal spec by default

* Add verbose logs to execution_layer

* Add --http-allow-sync-stalled flag

* Update lcli new-testnet to create genesis state

* Fix http test

* Fix compile errors in tests

beacon_node/http_api/tests/common.rs

@@ -133,6 +133,7 @@ pub async fn create_api_server<T: BeaconChainTypes>(
             allow_origin: None,
             serve_legacy_spec: true,
             tls_config: None,
+            allow_sync_stalled: false,
         },
         chain: Some(chain.clone()),
         network_tx: Some(network_tx),