Add Electra fork boilerplate (#5122)

* Add Electra fork boilerplate

* Remove electra from spec tests

* Fix tests

* Remove sneaky log file

* Fix more tests

* Fix even more tests and add suggestions

* Remove unrelated lcli addition

* Update more tests

* Merge branch 'unstable' into electra

* Add comment for test-suite lcli override

* Merge branch 'unstable' into electra

* Cleanup

* Merge branch 'unstable' into electra

* Apply suggestions

* Merge branch 'unstable' into electra

* Merge sigp/unstable into electra

* Merge branch 'unstable' into electra

consensus/state_processing/src/per_block_processing/process_operations.rs

@@ -265,7 +265,8 @@ pub fn process_attestations<T: EthSpec, Payload: AbstractExecPayload<T>>(
         BeaconBlockBodyRef::Altair(_)
         | BeaconBlockBodyRef::Merge(_)
         | BeaconBlockBodyRef::Capella(_)
-        | BeaconBlockBodyRef::Deneb(_) => {
+        | BeaconBlockBodyRef::Deneb(_)
+        | BeaconBlockBodyRef::Electra(_) => {
             altair_deneb::process_attestations(
                 state,
                 block_body.attestations(),