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>

testing/ef_tests/src/cases/ssz_static.rs

@@ -10,7 +10,8 @@ use types::{BeaconBlock, BeaconState, ForkName, Hash256, SignedBeaconBlock};
 #[derive(Debug, Clone, Deserialize)]
 struct SszStaticRoots {
     root: String,
-    signing_root: Option<String>,
+    #[serde(rename(deserialize = "signing_root"))]
+    _signing_root: Option<String>,
 }
 
 /// Runner for types that implement `ssz::Decode`.