assistant2: Expose `ActiveThread::thread` via a getter (#23577)

This PR exposes the `thread` file on the `ActiveThread` via a getter
rather than exposing the field directly.

Release Notes:

- N/A
ec91a8dc82Marshall Bowers committed on 1/23/2025, 9:54:16 PM· committed by GitHubparent52494f3
2 files changedLine totals unavailable