fix: move quoting logic for pgbackrest

[jason-lynch]

Summary

Replaces custom quoting logic with the shellescape library and moves it to only affect the Patroni bootstrap command.

Changes

Docker already escapes and quotes arguments, so the backup workflow breaks when we pre-quote those arguments. However, we still need the quoting when we build the bootstrap command in a Patroni config. Using a library for this handles more cases than just whitespace characters.

Testing

You can test this by adding restore_options to the local-backup-and-restore Bruno scenario, e.g.:

{
  "restore_config": {
    "source_database_id": "storefront",
    "source_node_name": "n1",
    "source_database_name": "storefront",
    "repository": {
      "id": "{{repository_id}}",
      "type": "posix",
      "base_path": "/backups"
    },
    "restore_options": {
      "type": "time",
      "target": "2025-12-19 13:27:12+00"
    }
  }
}

Note that when testing the restore functionality, you should use a timestamp after the end of the most recent full backup. When testing the create from backup functionality, you should just the beginning timestamp for your backup set. You can inspect your backup sets by running pgbackrest info inside the container, e.g.:

# use the dev-env.zsh helper to exec into the n1 container
cp-docker-exec

# then from inside the container
pgbackrest --stanza=db --config=/opt/pgedge/configs/pgbackrest.backup.conf

PLAT-365