Changes for devnet-8 (#4518)

* Addressed #4487

Add override threshold flag
Added tests for Override Threshold Flag
Override default shown in decimal

* Addressed #4445

Addressed Jimmy's Comments
No need for matches
Fix Mock Execution Engine Tests
Fix clippy
fix fcuv3 bug

* Fix Block Root Calculation post-Deneb

* Addressed #4444

Attestation Verification Post-Deneb
Fix Gossip Attestation Verification Test

* Addressed #4443

Fix Exit Signing for EIP-7044
Fix cross exit test
Move 7044 Logic to signing_context()

* Update EF Tests

* Addressed #4560

* Added Comments around EIP7045

* Combine Altair Deneb to Eliminate Duplicated Code

beacon_node/beacon_chain/tests/payload_invalidation.rs

@@ -1017,6 +1017,7 @@ async fn payload_preparation() {
             .unwrap(),
         fee_recipient,
         None,
+        None,
     );
     assert_eq!(rig.previous_payload_attributes(), payload_attributes);
 }