feat: adapt source and tests to reth 1.11.1 API changes

Port the source and test-utils changes required by the reth 1.11.1 /
Tsuki upgrade (mirrors scroll-tech/rollup-node scroll-tech#500):

- Use TaskExecutor::spawn_critical_task / spawn_task in place of the
  removed spawn / spawn_critical helpers.
- Implement RpcHandleProvider::rpc_handle_mut on ScrollAddOnsHandle.
- Replace TaskManager with TaskExecutor in the node test harness and
  move the graceful-shutdown closure accordingly.
- Rename TransactionTestContext::transfer_tx_nonce_bytes to
  transfer_tx_bytes_with_nonce.
- Update the sequencer setup() call sites to the new 2-tuple return.
- Regenerate anvil_state.json for the newer anvil serialization
  (adds gas_refund_counter).
- Test stabilizers: bump txpool max_account_slots, tolerate
  already-known transactions, wait on block_sequenced instead of a
  fixed sleep, raise integration timeouts to 120s, and run nextest with
  --test-threads 4.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

Author: dghelm

crates/node/tests/e2e.rs

@@ -450,11 +450,12 @@ async fn can_forward_tx_to_sequencer() -> eyre::Result<()> {
 
     // inject a transaction into the pool of the follower node
     let tx = generate_tx(wallet).await;
-    let res = follower_node[0].rpc.inject_tx(tx).await;
-    if let Err(ref e) = res {
+    if let Err(e) = follower_node[0].rpc.inject_tx(tx).await {
+        // Tolerate the tx already being in the follower pool (it can arrive via gossip from the
+        // sequencer peer); re-raise anything else.
         let msg = format!("{e:?}");
         if !msg.contains("already known") && !msg.contains("AlreadyImported") {
-            res.unwrap();
+            panic!("failed to inject tx into follower pool: {msg}");
         }
     }