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

validator_client/src/signing_method/web3signer.rs

@@ -28,6 +28,7 @@ pub enum ForkName {
     Bellatrix,
     Capella,
     Deneb,
+    Electra,
 }
 
 #[derive(Debug, PartialEq, Serialize)]
@@ -101,6 +102,11 @@ impl<'a, T: EthSpec, Payload: AbstractExecPayload<T>> Web3SignerObject<'a, T, Pa
                 block: None,
                 block_header: Some(block.block_header()),
             }),
+            BeaconBlock::Electra(_) => Ok(Web3SignerObject::BeaconBlock {
+                version: ForkName::Electra,
+                block: None,
+                block_header: Some(block.block_header()),
+            }),
         }
     }