fix(l2): bench crate

[xqft]

The pipeline was failing because of:

1. some breaking changes (renamed imports)
2. a previously existing bug that we didn't catch until perf(core): transform the inline variant of NodeHash to a const sized array #2516 (we were encoding a leaf node without its leaf flag, so it would be decoded into an extension leaf and produce a panic)
3. we were executing the prover in L2 mode because we depended on ethrex-l2 (and in ethrex-prover, which depends on ethrex-l2), and that crate enables the L2 feature of ethrex-vm by default.
   • The solution was to make an l2 feature for ethrex-l2, which isn't ideal. A better (but bigger) solution is proposed in L2: provers refactor #2662

[github-actions]

Lines of code report

Total lines added: 0
Total lines removed: 1
Total lines changed: 1

Detailed view

+-------------------------------------------+-------+------+
| File                                      | Lines | Diff |
+-------------------------------------------+-------+------+
| ethrex/crates/l2/prover/bench/src/main.rs | 95    | -1   |
+-------------------------------------------+-------+------+