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>

validator_client/src/http_metrics/metrics.rs

@@ -57,11 +57,6 @@ lazy_static::lazy_static! {
         "Total count of attempted block signings",
         &["status"]
     );
-    pub static ref SIGNED_BLOBS_TOTAL: Result<IntCounterVec> = try_create_int_counter_vec(
-        "vc_signed_beacon_blobs_total",
-        "Total count of attempted blob signings",
-        &["status"]
-    );
     pub static ref SIGNED_ATTESTATIONS_TOTAL: Result<IntCounterVec> = try_create_int_counter_vec(
         "vc_signed_attestations_total",
         "Total count of attempted Attestation signings",