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

Summary

TestFlashblocksSDMMaterializesPostExecBlock is skipped when the acceptance suite runs against kona-node.

kona-node times out before exposing its user RPC when launched by the flashblocks/rollup-boost preset.

Required work

Fix the Kona flashblocks preset startup path and verify the SDM materialization behavior before removing the Kona skip.

Acceptance criteria

• The root cause and resolution are documented.
• TestFlashblocksSDMMaterializesPostExecBlock no longer skips when DEVSTACK_L2CL_KIND=kona-node.
• The test preserves its post-execution block materialization assertions against both CL implementations.
• Existing op-node coverage continues to pass.

Related

• https://github.com/ethereum-optimism/optimism/issues/16450
• Parent inventory: https://github.com/ethereum-optimism/protocol-team/issues/101