op-acceptance-tests: run TestUnsafeGapFillAfterUnsafeReorg_RestartL2CL against kona-node

## Summary

[`TestUnsafeGapFillAfterUnsafeReorg_RestartL2CL`](https://github.com/ethereum-optimism/optimism/blob/develop/op-acceptance-tests/tests/sync/elsync/reorg/sync_test.go) is skipped when the acceptance suite runs against kona-node.

Kona times out waiting for the expected unsafe-head reorg after the verifier CL is restarted.

## Required work

Reproduce the restart path, distinguish persistence/startup synchronization from Kona unsafe-queue behavior, fix the responsible layer, and remove the Kona skip.

## Acceptance criteria

- [ ] The root cause and resolution are documented.
- [ ] `TestUnsafeGapFillAfterUnsafeReorg_RestartL2CL` no longer skips when `DEVSTACK_L2CL_KIND=kona-node`.
- [ ] After restarting kona-node, the verifier fills the gap and converges on the expected unsafe chain.
- [ ] Existing op-node coverage continues to pass.

## Related

- https://github.com/ethereum-optimism/optimism/issues/18676
- https://github.com/ethereum-optimism/optimism/issues/17694
- Parent inventory: https://github.com/ethereum-optimism/protocol-team/issues/101