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>

testing/ef_tests/src/cases/operations.rs

@@ -95,10 +95,7 @@ impl<E: EthSpec> Operation<E> for Attestation<E> {
                 &mut ctxt,
                 spec,
             ),
-            BeaconState::Altair(_)
-            | BeaconState::Merge(_)
-            | BeaconState::Capella(_)
-            | BeaconState::Eip4844(_) => {
+            BeaconState::Altair(_) | BeaconState::Merge(_) | BeaconState::Capella(_) => {
                 altair::process_attestation(state, self, 0, &mut ctxt, VerifySignatures::True, spec)
             }
         }