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/store/src/impls/execution_payload.rs

@@ -1,9 +1,6 @@
 use crate::{DBColumn, Error, StoreItem};
 use ssz::{Decode, Encode};
-use types::{
-    EthSpec, ExecutionPayload, ExecutionPayloadCapella, ExecutionPayloadEip4844,
-    ExecutionPayloadMerge,
-};
+use types::{EthSpec, ExecutionPayload, ExecutionPayloadCapella, ExecutionPayloadMerge};
 
 macro_rules! impl_store_item {
     ($ty_name:ident) => {
@@ -24,7 +21,6 @@ macro_rules! impl_store_item {
 }
 impl_store_item!(ExecutionPayloadMerge);
 impl_store_item!(ExecutionPayloadCapella);
-impl_store_item!(ExecutionPayloadEip4844);
 
 /// This fork-agnostic implementation should be only used for writing.
 ///
@@ -40,13 +36,9 @@ impl<E: EthSpec> StoreItem for ExecutionPayload<E> {
     }
 
     fn from_store_bytes(bytes: &[u8]) -> Result<Self, Error> {
-        ExecutionPayloadEip4844::from_ssz_bytes(bytes)
-            .map(Self::Eip4844)
-            .or_else(|_| {
-                ExecutionPayloadCapella::from_ssz_bytes(bytes)
-                    .map(Self::Capella)
-                    .or_else(|_| ExecutionPayloadMerge::from_ssz_bytes(bytes).map(Self::Merge))
-            })
+        ExecutionPayloadCapella::from_ssz_bytes(bytes)
+            .map(Self::Capella)
+            .or_else(|_| ExecutionPayloadMerge::from_ssz_bytes(bytes).map(Self::Merge))
             .map_err(Into::into)
     }
 }