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_slot_processing.rs

@@ -1,6 +1,4 @@
-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 crate::{per_epoch_processing::EpochProcessingSummary, *};
 use safe_arith::{ArithError, SafeArith};
 use types::*;
@@ -61,10 +59,6 @@ pub fn per_slot_processing<T: EthSpec>(
         if spec.capella_fork_epoch == Some(state.current_epoch()) {
             upgrade_to_capella(state, spec)?;
         }
-        // Eip4844
-        if spec.eip4844_fork_epoch == Some(state.current_epoch()) {
-            upgrade_to_eip4844(state, spec)?;
-        }
     }
 
     Ok(summary)