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

## Summary

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

With L2 P2P isolated, Kona remains in `AwaitingELSyncCompletion` instead of bootstrapping from L1 into the force-build derivation path.

## Required work

Reproduce the isolated-verifier path, fix Kona's EL-sync/bootstrap transition or the backend-neutral fixture as appropriate, and remove the Kona skip.

## Acceptance criteria

- [ ] The root cause and resolution are documented.
- [ ] `TestSDMPostExecBlockDerivesOnIsolatedVerifier` no longer skips when `DEVSTACK_L2CL_KIND=kona-node`.
- [ ] An isolated Kona verifier derives and force-builds the expected SDM post-execution block from L1 data.
- [ ] Existing op-node coverage continues to pass.

## Related

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