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Remove `billing-v2` feature flag (#38843)

This PR removes the `billing-v2` feature flag, now that the new pricing
is launched.

Release Notes:

- N/A
17e55daf6fMarshall Bowers committed on 9/25/2025, 2:11:48 AM· committed by GitHubparent6b968e0
8 files changedLine totals unavailable