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Add `PostgresDatabaseMigrator` for (testing) migration (#1655)

Adds a new `PostgresDatabaseMigrator` that has the core logic of `postgres-shift`, as well as a testing method. The `migrate` method mirrors `postgres-shift` and the `test` method reuses part of it, executing each migration in a separate transaction. It allows us to interact with the database _before_ and _after_ a migration has executed, stopping after the desired migration:

- Create `PostgresDatabaseMigrator` and inject it
- Remove `postgres-shift` and associated definition/patch, replacing usage with the above
- Add appropriate test coverage

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