bark-json: Correctly add exit depth to wallet vtxo json

Steven Rooserequested to merge
rest-add-exit-depth into master
  • check or remove this line after you've added a CHANGELOG entry or if your PR doesn't need one (they should go into CHANGELOG/unreleased/)

Summary by CodeRabbit

  • Bug Fixes
    • Fixed missing exit_depth values in VTXO listings and related VTXO details.
    • Improved VTXO import and listing responses so existing data is preserved while generating output.
Edited by coderabbit

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