Final changes for fusaka-devnet-2 (#7655)

Closes #7467.

This PR primarily addresses [the P2P changes](https://github.com/ethereum/EIPs/pull/9840) in [fusaka-devnet-2](https://fusaka-devnet-2.ethpandaops.io/). Specifically:

* [the new `nfd` parameter added to the `ENR`](https://github.com/ethereum/EIPs/pull/9840)
* [the modified `compute_fork_digest()` changes for every BPO fork](https://github.com/ethereum/EIPs/pull/9840)

90% of this PR was absolutely hacked together as fast as possible during the Berlinterop as fast as I could while running between Glamsterdam debates. Luckily, it seems to work. But I was unable to be as careful in avoiding bugs as I usually am. I've cleaned up the things *I remember* wanting to come back and have a closer look at. But still working on this.

Progress:
* [x] get it working on `fusaka-devnet-2`
* [ ] [*optional* disconnect from peers with incorrect `nfd` at the fork boundary](https://github.com/ethereum/consensus-specs/pull/4407) - Can be addressed in a future PR if necessary
* [x] first pass clean-up
* [x] fix up all the broken tests
* [x] final self-review
* [x] more thorough review from people more familiar with affected code

beacon_node/network/src/sync/manager.rs

@@ -264,7 +264,7 @@ pub fn spawn<T: BeaconChainTypes>(
     fork_context: Arc<ForkContext>,
 ) {
     assert!(
-        beacon_chain.spec.max_request_blocks(fork_context.current_fork()) as u64 >= T::EthSpec::slots_per_epoch() * EPOCHS_PER_BATCH,
+        beacon_chain.spec.max_request_blocks(fork_context.current_fork_name()) as u64 >= T::EthSpec::slots_per_epoch() * EPOCHS_PER_BATCH,
         "Max blocks that can be requested in a single batch greater than max allowed blocks in a single request"
     );
 

beacon_node/network/src/sync/network_context.rs

@@ -879,7 +879,7 @@ impl<T: BeaconChainTypes> SyncNetworkContext<T> {
             request: RequestType::DataColumnsByRoot(
                 request
                     .clone()
-                    .try_into_request(self.fork_context.current_fork(), &self.chain.spec)?,
+                    .try_into_request(self.fork_context.current_fork_name(), &self.chain.spec)?,
             ),
             app_request_id: AppRequestId::Sync(SyncRequestId::DataColumnsByRoot(id)),
         })?;