op-acceptance-tests: run TestSuperPermissionedWithdrawal against kona-node

## Summary

[`TestSuperPermissionedWithdrawal`](https://github.com/ethereum-optimism/optimism/blob/develop/op-acceptance-tests/tests/proofs/super/withdrawal_test.go) is skipped when the acceptance suite runs against kona-node.

The shared withdrawal helper requires `superroot_atTimestamp`, which kona-node does not currently serve.

## Required work

Provide the required super-root lookup through Kona or make the shared helper backend-neutral, then remove the Kona skip without weakening the withdrawal assertions.

## Acceptance criteria

- [ ] The root cause and resolution are documented.
- [ ] `TestSuperPermissionedWithdrawal` no longer skips when `DEVSTACK_L2CL_KIND=kona-node`.
- [ ] The permissioned super-root withdrawal flow completes against kona-node/op-reth.
- [ ] Existing op-node coverage continues to pass.

## Related

- https://github.com/ethereum-optimism/optimism/issues/21861
- Parent inventory: https://github.com/ethereum-optimism/protocol-team/issues/101