This PR removes the code for the legacy plans.
No more users will be on this plan as of January 17th, so it's fine to
land these changes now (as they won't be released until the 21st).
Closes CLO-76.
Release Notes:
- N/A
6fcc5e9461Marshall Bowers committed on 1/15/2026, 6:06:45 PM· committed by GitHubparent1ded60a