collab: Use `StripeClient` for creating model usage meter events (#31633)
This PR updates the `StripeBilling::bill_model_request_usage` method to
use the `StripeClient` trait.
Release Notes:
- N/A
469824c350Marshall Bowers committed on 5/28/2025, 10:19:43 PM· committed by GitHubparenta1c645e