Remove merge transition code (#8761)

Co-Authored-By: dapplion <35266934+dapplion@users.noreply.github.com>

beacon_node/http_api/tests/status_tests.rs

@@ -21,15 +21,8 @@ async fn post_merge_tester(chain_depth: u64, validator_count: u64) -> Interactiv
     let tester = InteractiveTester::<E>::new(Some(spec), validator_count as usize).await;
     let harness = &tester.harness;
     let mock_el = harness.mock_execution_layer.as_ref().unwrap();
-    let execution_ctx = mock_el.server.ctx.clone();
 
-    // Move to terminal block.
     mock_el.server.all_payloads_valid();
-    execution_ctx
-        .execution_block_generator
-        .write()
-        .move_to_terminal_block()
-        .unwrap();
 
     // Create some chain depth.
     harness.advance_slot();