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/errors.rs

@@ -258,11 +258,6 @@ pub enum BlockProductionError {
     BlockingFailed(execution_layer::Error),
     TerminalPoWBlockLookupFailed(execution_layer::Error),
     GetPayloadFailed(execution_layer::Error),
-    GetBlobsFailed(execution_layer::Error),
-    BlobPayloadMismatch {
-        blob_block_hash: ExecutionBlockHash,
-        payload_block_hash: ExecutionBlockHash,
-    },
     FailedToReadFinalizedBlock(store::Error),
     MissingFinalizedBlock(Hash256),
     BlockTooLarge(usize),