Resume the payment step from kessai's expiry, configurable per step

Frank Mablyrequested to merge
issue/orchestra-3611873:3611873-resume-the-payment into 1.x

Merge request for #3611873.

PaymentWorkflowBridge::onExpired resumes the pinned step with a dedicated expired result; PaymentInteraction gains a payment_timeout setting (a duration, seconds or ISO 8601, via orchestra's Duration) passed to kessai as the payment ttl; the example workflow adopts the new model. Kernel-tested.

Depends on kessai #3611872 (kessai.expired); CI here goes green once that lands in kessai 1.x-dev.

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