Add Deneb builder test & update mock builder (#4607)

* Update mock builder, mev-rs dependencies, eth2 lib to support deneb builder flow

* Replace `sharingForkTime` with `cancunTime`

* Patch `ethereum-consensus` to include some deneb-devnet-8 changes

* Add deneb builder test and fix block contents deserialization

* Fix builder bid encoding issue and passing deneb builder test \o/

* Fix test compilation

* Revert `cancunTime` change in genesis to pass doppelganger tests

common/eth2/src/lib.rs

@@ -833,17 +833,16 @@ impl BeaconNodeHttpClient {
     }
 
     /// `POST v2/beacon/blinded_blocks`
-    //TODO(sean) update this along with builder updates
-    pub async fn post_beacon_blinded_blocks_v2<T: EthSpec>(
+    pub async fn post_beacon_blinded_blocks_v2<T: EthSpec, Payload: AbstractExecPayload<T>>(
         &self,
-        block: &SignedBlindedBeaconBlock<T>,
+        block_contents: &SignedBlockContents<T, Payload>,
         validation_level: Option<BroadcastValidation>,
     ) -> Result<(), Error> {
         self.post_generic_with_consensus_version(
             self.post_beacon_blinded_blocks_v2_path(validation_level)?,
-            block,
+            block_contents,
             Some(self.timeouts.proposal),
-            block.message().body().fork_name(),
+            block_contents.signed_block().message().body().fork_name(),
         )
         .await?;