fix: correct confirmations for UTXOs in wallet FFI

[xdustinface]

managed_wallet_get_utxos currently just returns 1 confirmation for a UTXO in FFIUTXO. This makes use of the synced_height to get the actual confirmations.

Based on:

• feat: track synced_height per ManagedWalletInfo #305

[coderabbitai]

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✨ Finishing touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment
• Commit unit tests in branch fix/ffi-utxo-confirmations

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[github-actions]

This PR has merge conflicts with the base branch. Please rebase or merge the base branch into your branch to resolve them.