assistant_context_editor: Put `use`s in the right spot (#23579)

This PR cleans up some `use` statements that weren't at the very top of
the module.

Release Notes:

- N/A
35ddb432b3Marshall Bowers committed on 1/23/2025, 9:58:33 PM· committed by GitHubparentec91a8d
1 file changedLine totals unavailable