Remove all prod eth1 related code (#7133)

N/A


  After the electra fork which includes EIP 6110, the beacon node no longer needs the eth1 bridging mechanism to include new deposits as they are provided by the EL as a `deposit_request`. So after electra + a transition period where the finalized bridge deposits pre-fork are included through the old mechanism, we no longer need the elaborate machinery we had to get deposit contract data from the execution layer.

Since holesky has already forked to electra and completed the transition period, this PR basically checks to see if removing all the eth1 related logic leads to any surprises.

beacon_node/client/src/config.rs

@@ -59,7 +59,6 @@ pub struct Config {
     /// Path where the blobs database will be located if blobs should be in a separate database.
     pub blobs_db_path: Option<PathBuf>,
     pub log_file: PathBuf,
-    pub sync_eth1_chain: bool,
     /// Graffiti to be inserted everytime we create a block if the validator doesn't specify.
     pub beacon_graffiti: GraffitiOrigin,
     pub validator_monitor: ValidatorMonitorConfig,
@@ -70,7 +69,6 @@ pub struct Config {
     pub store: store::StoreConfig,
     pub network: network::NetworkConfig,
     pub chain: beacon_chain::ChainConfig,
-    pub eth1: eth1::Config,
     pub execution_layer: Option<execution_layer::Config>,
     pub trusted_setup: TrustedSetup,
     pub http_api: http_api::Config,
@@ -99,8 +97,6 @@ impl Default for Config {
             store: <_>::default(),
             network: NetworkConfig::default(),
             chain: <_>::default(),
-            sync_eth1_chain: true,
-            eth1: <_>::default(),
             execution_layer: None,
             trusted_setup,
             beacon_graffiti: GraffitiOrigin::default(),