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>

beacon_node/beacon_chain/src/execution_payload.rs

@@ -406,9 +406,7 @@ pub fn get_execution_payload<
     let latest_execution_payload_header_block_hash =
         state.latest_execution_payload_header()?.block_hash();
     let withdrawals = match state {
-        &BeaconState::Capella(_) | &BeaconState::Eip4844(_) => {
-            Some(get_expected_withdrawals(state, spec)?.into())
-        }
+        &BeaconState::Capella(_) => Some(get_expected_withdrawals(state, spec)?.into()),
         &BeaconState::Merge(_) => None,
         // These shouldn't happen but they're here to make the pattern irrefutable
         &BeaconState::Base(_) | &BeaconState::Altair(_) => None,