1.57.0 lints (#2850)

## Issue Addressed

New rust lints

## Proposed Changes

- Boxing some enum variants
- removing some unused fields (is the validator lockfile unused? seemed so to me)

## Additional Info

- some error fields were marked as dead code but are logged out in areas
- left some dead fields in our ef test code because I assume they are useful for debugging?

Co-authored-by: realbigsean <seananderson33@gmail.com>

beacon_node/src/config.rs

@@ -226,7 +226,7 @@ pub fn get_config<E: EthSpec>(
         client_config.sync_eth1_chain = true;
         client_config.eth1.endpoints = endpoints
             .split(',')
-            .map(|s| SensitiveUrl::parse(s))
+            .map(SensitiveUrl::parse)
             .collect::<Result<_, _>>()
             .map_err(|e| format!("eth1-endpoints contains an invalid URL {:?}", e))?;
     }
@@ -245,7 +245,7 @@ pub fn get_config<E: EthSpec>(
         client_config.sync_eth1_chain = true;
         client_config.execution_endpoints = endpoints
             .split(',')
-            .map(|s| SensitiveUrl::parse(s))
+            .map(SensitiveUrl::parse)
             .collect::<Result<_, _>>()
             .map(Some)
             .map_err(|e| format!("execution-endpoints contains an invalid URL {:?}", e))?;