chore: add postgres.js tests (#860)

Add `postgres.js` tests. `extended_anonymous` is required for unsafe
SQL.

Author: levkk

integration/js/pg_tests/package-lock.json

@@ -14,6 +14,7 @@
   "dependencies": {
     "@prisma/client": "^6.5.0",
     "pg": "^8.14.1",
+    "postgres": "^3.4.7",
     "pg-hstore": "^2.3.4",
     "sequelize": "^6.32.1"
   },