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/fork_choice/tests/tests.rs

@@ -435,7 +435,12 @@ impl ForkChoiceTest {
         let validator_committee_index = 0;
         let validator_index = *head
             .beacon_state
-            .get_beacon_committee(current_slot, attestation.data().index)
+            .get_beacon_committee(
+                current_slot,
+                attestation
+                    .committee_index()
+                    .expect("should get committee index"),
+            )
             .expect("should get committees")
             .committee
             .get(validator_committee_index)