cloud_llm_client: Remove unused code (#47774)

This PR removes some unused code around the plan types from the
`cloud_llm_client`.

Release Notes:

- N/A
39b34f8f33Marshall Bowers committed on 1/27/2026, 3:24:58 PM· committed by GitHubparentf324c3e
1 file changedLine totals unavailable