GH-598-hot-fix-panic-bug: fixed

[bertllll]

Note

Refactors outbound payments handling to send a single SentPayables (success or error) and avoid duplicate ScanError notifications; tests updated to match.

• BlockchainBridge (node/src/blockchain/blockchain_bridge.rs):
  • Refactor handle_outbound_payments_instructions to use then and always emit one SentPayables message (success or error), returning Ok(()) to suppress propagation and avoid duplicate error notifications.
  • Add TODO explaining temporary workaround to prevent duplicate scanner panics.
• Tests:
  • Update expectations by commenting out ScanError assertions and adjusting message counts (now only SentPayables recorded).

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[utkarshg6]

Good Job!