Fix Rust beta compiler errors 1.78.0-beta.1 (#5439)

* remove redundant imports

* fix test

* contains key

* fmt

* Merge branch 'unstable' into fix-beta-compiler

beacon_node/store/src/hot_cold_store.rs

@@ -33,13 +33,11 @@ use state_processing::{
     BlockProcessingError, BlockReplayer, SlotProcessingError, StateProcessingStrategy,
 };
 use std::cmp::min;
-use std::convert::TryInto;
 use std::marker::PhantomData;
 use std::num::NonZeroUsize;
 use std::path::Path;
 use std::sync::Arc;
 use std::time::Duration;
-use types::blob_sidecar::BlobSidecarList;
 use types::*;
 
 /// On-disk database that stores finalized states efficiently.