SlackDisconnectedPrincipal

One principal that a disconnect actually unbound.

Every field is an observation of what happened to THAT principal, so the CLI
can tell the user the truth rather than echoing a canned success message.

{
    "grant_deleted": true,
    "idp_revocation": "not_attempted",
    "intents_deleted": 0,
    "slack_principal_id": "string"
}