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/fork_choice/src/fork_choice.rs

@@ -764,7 +764,8 @@ where
             (parent_justified, parent_finalized)
         } else {
             let justification_and_finalization_state = match block {
-                BeaconBlockRef::Deneb(_)
+                BeaconBlockRef::Electra(_)
+                | BeaconBlockRef::Deneb(_)
                 | BeaconBlockRef::Capella(_)
                 | BeaconBlockRef::Merge(_)
                 | BeaconBlockRef::Altair(_) => match progressive_balances_mode {