copilot_chat: Remove settings dependency (#62205)

Removes an unnecessary dependency on settings as
`settings::OpenAiReasoningEffort` just points to
`language_model::ReasoningEffort`

Release Notes:

- N/A
0fb9a9da49Bennet Bo Fenner committed on 8/5/2026, 12:34:32 PM· committed by GitHubparent6943d73
3 files changedLine totals unavailable