Fixes #1437. Now that the effects of the `migrations/db/init-scripts` are fully tested on the following files: - [nix/tests/sql/auth.out](https://github.com/supabase/postgres/blob/develop/nix/tests/expected/auth.out) - [nix/tests/sql/storage.out](https://github.com/supabase/postgres/blob/develop/nix/tests/expected/storage.out) - [nix/tests/sql/roles.out](https://github.com/supabase/postgres/blob/develop/nix/tests/expected/roles.out) - [nix/tests/sql/evtrigs.out](https://github.com/supabase/postgres/blob/develop/nix/tests/expected/evtrigs.out) - [nix/tests/sql/extensions_schema.out](https://github.com/supabase/postgres/blob/develop/nix/tests/expected/extensions_schema.out) - [nix/tests/sql/realtime.out](https://github.com/supabase/postgres/blob/develop/nix/tests/expected/realtime.out) This reattempts to move `migrations/db/init-scripts` to `migrations/db/migrations` and have a single directory for migrations. Of the above tests, the only change pertains to the event triggers owners which is the problem on #1437. This requires modifying migrations, but the changes are more about following best practices: + Makes migrations idempotent. + [alter default privileges](https://www.postgresql.org/docs/current/sql-alterdefaultprivileges.html) explicitly list postgres as the target role. + Also: - adds a conditional for pgjwt which is not available on the 17 version - Realtime publication maintains the same postgres owner

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