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/src/attestation_verification.rs

@@ -55,7 +55,7 @@ use std::borrow::Cow;
 use strum::AsRefStr;
 use tree_hash::TreeHash;
 use types::{
-    Attestation, BeaconCommittee, ChainSpec, CommitteeIndex, Epoch, EthSpec, Hash256,
+    Attestation, BeaconCommittee, ChainSpec, CommitteeIndex, Epoch, EthSpec, ForkName, Hash256,
     IndexedAttestation, SelectionProof, SignedAggregateAndProof, Slot, SubnetId,
 };
 
@@ -1049,10 +1049,21 @@ pub fn verify_propagation_slot_range<S: SlotClock, E: EthSpec>(
     }
 
     // Taking advantage of saturating subtraction on `Slot`.
-    let earliest_permissible_slot = slot_clock
+    let one_epoch_prior = slot_clock
         .now_with_past_tolerance(spec.maximum_gossip_clock_disparity())
         .ok_or(BeaconChainError::UnableToReadSlot)?
         - E::slots_per_epoch();
+
+    let current_fork =
+        spec.fork_name_at_slot::<E>(slot_clock.now().ok_or(BeaconChainError::UnableToReadSlot)?);
+    let earliest_permissible_slot = match current_fork {
+        ForkName::Base | ForkName::Altair | ForkName::Merge | ForkName::Capella => one_epoch_prior,
+        // EIP-7045
+        ForkName::Deneb => one_epoch_prior
+            .epoch(E::slots_per_epoch())
+            .start_slot(E::slots_per_epoch()),
+    };
+
     if attestation_slot < earliest_permissible_slot {
         return Err(Error::PastSlot {
             attestation_slot,