Drive the order's checkout lock from the payment round-trip

Frank Mablyrequested to merge
issue/yoyaku-3611856:3611856-drive-the-orders into 1.x

Merge request for #3611856.

A new OrderLockSubscriber (yoyaku_payment) locks the order on kessai.initiated and unlocks it on failure/cancellation; the example workflow drops n_lock/n_unlock (kept n_place on both branches, kept the action plugins). E2E asserts the new bracket.

Depends on kessai kessai.initiated (kessai #3611852); CI here goes green once that lands in kessai 1.x-dev.

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