copilot: Remove PromptTokensDetails from Usage struct (#33029)
Closes #33024
Release Notes:
- Removed `PromptTokensDetails` from `Usage` as Gemini no longer
supplies cached token data for copilot.
1f736ed693Umesh Yadav committed on 6/19/2025, 2:37:58 PM· committed by GitHubparent0b228ad