Clean capella (#4019)

## Issue Addressed

Cleans up all the remnants of 4844 in capella. This makes sure when 4844 is reviewed there is nothing we are missing because it got included here 

## Proposed Changes

drop a bomb on every 4844 thing 

## Additional Info

Merge process I did (locally) is as follows:
- squash merge to produce one commit
- in new branch off unstable with the squashed commit create a `git revert HEAD` commit
- merge that new branch onto 4844 with `--strategy ours`
- compare local 4844 to remote 4844 and make sure the diff is empty
- enjoy

Co-authored-by: Paul Hauner <paul@paulhauner.com>

consensus/state_processing/src/genesis.rs

@@ -2,9 +2,7 @@ use super::per_block_processing::{
     errors::BlockProcessingError, process_operations::process_deposit,
 };
 use crate::common::DepositDataTree;
-use crate::upgrade::{
-    upgrade_to_altair, upgrade_to_bellatrix, upgrade_to_capella, upgrade_to_eip4844,
-};
+use crate::upgrade::{upgrade_to_altair, upgrade_to_bellatrix, upgrade_to_capella};
 use safe_arith::{ArithError, SafeArith};
 use tree_hash::TreeHash;
 use types::DEPOSIT_TREE_DEPTH;
@@ -93,23 +91,6 @@ pub fn initialize_beacon_state_from_eth1<T: EthSpec>(
         }
     }
 
-    // Upgrade to eip4844 if configured from genesis
-    if spec
-        .eip4844_fork_epoch
-        .map_or(false, |fork_epoch| fork_epoch == T::genesis_epoch())
-    {
-        upgrade_to_eip4844(&mut state, spec)?;
-
-        // Remove intermediate Capella fork from `state.fork`.
-        state.fork_mut().previous_version = spec.eip4844_fork_version;
-
-        // Override latest execution payload header.
-        // See https://github.com/ethereum/consensus-specs/blob/dev/specs/eip4844/beacon-chain.md#testing
-        if let Some(ExecutionPayloadHeader::Eip4844(header)) = execution_payload_header {
-            *state.latest_execution_payload_header_eip4844_mut()? = header;
-        }
-    }
-
     // Now that we have our validators, initialize the caches (including the committees)
     state.build_all_caches(spec)?;