bark: Refactor exit status endpoints

Peterrequested to merge
new-exit-status-endpoints 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

  • New Features

    • Added a new exit cancellation command and API so in-progress exits can be stopped before final broadcast.
    • Split exit status views into live, finished, and all exits, with an option to include finished exits in listings.
    • Introduced a new canceled exit state and related status responses.

  • Bug Fixes

    • Exit listings now exclude completed or canceled exits by default, reducing clutter and making active exits easier to track.
    • Status queries now work more consistently for both active and finished exits.
Edited by Peter

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