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/per_block_processing/process_operations.rs

@@ -256,8 +256,7 @@ pub fn process_attestations<T: EthSpec, Payload: AbstractExecPayload<T>>(
         }
         BeaconBlockBodyRef::Altair(_)
         | BeaconBlockBodyRef::Merge(_)
-        | BeaconBlockBodyRef::Capella(_)
-        | BeaconBlockBodyRef::Eip4844(_) => {
+        | BeaconBlockBodyRef::Capella(_) => {
             altair::process_attestations(
                 state,
                 block_body.attestations(),