collab: Return increased limit for extended trials from `GET /billing/usage` (#29771)

This PR updates the `GET /billing/usage` endpoint to return the
increased usage limit for users in the extended trial.

Release Notes:

- N/A
0c0a4ed866Marshall Bowers committed on 5/2/2025, 2:31:30 AM· committed by GitHubparent51f1998
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