Add Electra forks to basic sim tests (#7199)

This PR adds transitions to Electra ~~and Fulu~~ fork epochs in the simulator tests.

~~It also covers blob inclusion verification and data column syncing on a full node in Fulu.~~

UPDATE: Remove fulu fork from sim tests due to https://github.com/sigp/lighthouse/pull/7199#issuecomment-2852281176

beacon_node/beacon_chain/src/data_availability_checker/overflow_lru_cache.rs

@@ -331,7 +331,7 @@ impl<E: EthSpec> PendingComponents<E> {
             format!(
                 "block {} blobs {}/{}",
                 block_count,
-                self.verified_blobs.len(),
+                self.verified_blobs.iter().flatten().count(),
                 num_expected_blobs
             )
         }