bark: Offboard using offboard swap wait for confirmations before marking movement successful

Gideon Baturerequested to merge
GideonBature/bark:offboard-swap-wait-confirmations into master

This MR improves offboard behaviour so that instead of directly marking movements as successful, bark now waits for the offboard transaction to confirm on-chain. If the transaction fails to confirm, the movement can be cancelled and VTXOs restored to spendable state.

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Closes #1333 (closed)

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