Fix failing attestation tests and misc electra attestation cleanup (#5810)

* - get attestation related beacon chain tests to pass
- observed attestations are now keyed off of data + committee index
- rename op pool attestationref to compactattestationref
- remove unwraps in agg pool and use options instead
- cherry pick some changes from ef-tests-electra

* cargo fmt

* fix failing test

* Revert dockerfile changes

* make committee_index return option

* function args shouldnt be a ref to attestation ref

* fmt

* fix dup imports

---------

Co-authored-by: realbigsean <seananderson33@GMAIL.com>

consensus/state_processing/src/per_block_processing/signature_sets.rs

@@ -326,6 +326,7 @@ where
         genesis_validators_root,
     );
 
+    // TODO(electra), signing root isnt unique in the case of electra
     let message = indexed_attestation.data().signing_root(domain);
 
     Ok(SignatureSet::multiple_pubkeys(signature, pubkeys, message))
@@ -436,7 +437,6 @@ where
     let message = slot.signing_root(domain);
     let signature = signed_aggregate_and_proof.message().selection_proof();
     let validator_index = signed_aggregate_and_proof.message().aggregator_index();
-
     Ok(SignatureSet::single_pubkey(
         signature,
         get_pubkey(validator_index as usize).ok_or(Error::ValidatorUnknown(validator_index))?,