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collab: Remove database migrations (#44436)

This PR removes the database schema migrations from the repo, as these
are now managed by Cloud.

There's a new `20251208000000_test_schema.sql` "migration" that we use
to create the database schema for the tests, similar to what we use for
SQLite.

Release Notes:

- N/A
8d44bcd4f9Marshall Bowers committed on 12/8/2025, 10:53:14 PM· committed by GitHubparent1888106
64 files changedLine totals unavailable