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collab: Remove unused billing-related database code (#36282)

This PR removes a bunch of unused database code related to billing, as
we no longer need it.

Release Notes:

- N/A
e664a9bc48Marshall Bowers committed on 8/15/2025, 10:58:10 PM· committed by GitHubparentbf34e18
36 files changedLine totals unavailable