Remove some "wontfix" TODOs for the merge (#3449)

## Issue Addressed

NA

## Proposed Changes

Removes three types of TODOs:

1. `execution_layer/src/lib.rs`: It was [determined](https://github.com/ethereum/consensus-specs/issues/2636#issuecomment-988688742) that there is no action required here.
2. `beacon_processor/worker/gossip_methods.rs`: Removed TODOs relating to peer scoring that have already been addressed via `epe.penalize_peer()`.
    - It seems `cargo fmt` wanted to adjust some things here as well 🤷 
3. `proto_array_fork_choice.rs`: it would be nice to remove that useless `bool` for cleanliness, but I don't think it's something we need to do and the TODO just makes things look messier IMO.


## Additional Info

There should be no functional changes to the code in this PR.

There are still some TODOs lingering, those ones require actual changes or more thought.

consensus/proto_array/src/proto_array_fork_choice.rs

@@ -38,7 +38,7 @@ pub enum ExecutionStatus {
     ///
     /// This `bool` only exists to satisfy our SSZ implementation which requires all variants
     /// to have a value. It can be set to anything.
-    Irrelevant(bool), // TODO(merge): fix bool.
+    Irrelevant(bool),
 }
 
 impl ExecutionStatus {