Deneb pr updates 2 (#4851)

* use workspace deps in kzg crate

* delete unused blobs dp path field

* full match on fork name in engine api get payload v3

* only accept v3 payloads on get payload v3 endpoint in mock el

* remove FIXMEs related to merge transition tests

* move static tx to test utils

* default max_per_epoch_activation_churn_limit to mainnet value

* remove unnecessary async

* remove comment

* use task executor in `blob_sidecars` endpoint

beacon_node/execution_layer/src/engine_api/http.rs

@@ -897,10 +897,9 @@ impl HttpJsonRpc {
                     .await?;
                 Ok(JsonGetPayloadResponse::V3(response).into())
             }
-            _ => Err(Error::UnsupportedForkVariant(format!(
-                "called get_payload_v3 with {}",
-                fork_name
-            ))),
+            ForkName::Base | ForkName::Altair | ForkName::Merge | ForkName::Capella => Err(
+                Error::UnsupportedForkVariant(format!("called get_payload_v3 with {}", fork_name)),
+            ),
         }
     }