Electra attestation changes sean review (#5972)

* instantiate empty bitlist in unreachable code

* clean up error conversion

* fork enabled bool cleanup

* remove a couple todos

* return bools instead of options in `aggregate` and use the result

* delete commented out code

* use map macros in simple transformations

* remove signers_disjoint_from

* get ef tests compiling

* get ef tests compiling

* update intentionally excluded files

consensus/state_processing/src/verify_operation.rs

@@ -48,7 +48,6 @@ pub trait TransformPersist {
 pub struct SigVerifiedOp<T: TransformPersist, E: EthSpec> {
     op: T,
     verified_against: VerifiedAgainst,
-    //#[ssz(skip_serializing, skip_deserializing)]
     _phantom: PhantomData<E>,
 }