Rust 1.95 lints (#9142)

N/A


  Adds lints for rust 1.95. Mostly cosmetic.
1. .zip(a.into_iter()) -> .zip(a) . Also a few more places where into_iter is not required
2. replace sort_by with sort_by_key
3. move if statements inside match block.
4. use checked_div instead of if statements. I think this is debatable in terms of being better, happy to remove it if others also feel its unnecessary


Co-Authored-By: Pawan Dhananjay <pawandhananjay@gmail.com>

beacon_node/beacon_chain/src/attestation_rewards.rs

@@ -320,7 +320,7 @@ impl<T: BeaconChainTypes> BeaconChain<T> {
             )
             .into_values()
             .collect::<Vec<IdealAttestationRewards>>();
-        ideal_rewards.sort_by(|a, b| a.effective_balance.cmp(&b.effective_balance));
+        ideal_rewards.sort_by_key(|a| a.effective_balance);
 
         Ok(StandardAttestationRewards {
             ideal_rewards,