Remove redundant subscribe_all_data_column_subnets field from network (#8259)

Addresses this comment: https://github.com/sigp/lighthouse/pull/8254#discussion_r2447998786

We're currently using `subscribe_all_data_column_subnets` here to subscribe to all subnets
522bd9e9c6/beacon_node/lighthouse_network/src/types/topics.rs (L82-L92)

But its unnecessary because the else path also works for supernode (uses `sampling_subnets` instead)

The big diffs will disappear once #8254 is merged.


  


Co-Authored-By: Jimmy Chen <jchen.tc@gmail.com>

lcli/src/generate_bootnode_enr.rs

@@ -43,7 +43,7 @@ pub fn run<E: EthSpec>(matches: &ArgMatches, spec: &ChainSpec) -> Result<(), Str
         &enr_key,
         &config,
         &enr_fork_id,
-        None,
+        spec.custody_requirement,
         genesis_fork_digest,
         spec,
     )