Add migration to drop the auth_user table

resources/migrations/20250108123417-remove-auth-user.down.sql

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+-- this change cannot be undone, sorry

resources/migrations/20250108123417-remove-auth-user.up.sql

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+-- Drop the references to the auth_user table and the auth_user table
+-- itself, as users are now handled in LDAP
+
+ALTER TABLE documents_version
+DROP FOREIGN KEY IF EXISTS created_by_id_refs_id_1368ec995012716;
+
+--;;
+
+ALTER TABLE documents_version
+DROP COLUMN IF EXISTS created_by_id;
+
+--;;
+
+ALTER TABLE documents_document
+DROP FOREIGN KEY IF EXISTS assigned_to_id_refs_id_76390739499bcb48;
+
+--;;
+
+ALTER TABLE documents_document
+DROP COLUMN IF EXISTS assigned_to_id;
+
+--;;
+
+DROP TABLE auth_user;
+