fix(testdata): restructure PGX v5 enum test with separate schema/query files

Use schema.sql and query.sql as separate files instead of a shared sql/
directory, matching the pattern used by other enum tests.

Author: winens

…pes_enum/postgresql/pgx/v5/sql/query.sql …l_types_enum/postgresql/pgx/v5/query.sqlinternal/endtoend/testdata/emit_pointers_for_null_types_enum/postgresql/pgx/v5/sql/query.sql renamed to internal/endtoend/testdata/emit_pointers_for_null_types_enum/postgresql/pgx/v5/query.sql internal/endtoend/testdata/emit_pointers_for_null_types_enum/postgresql/pgx/v5/sql/query.sql renamed to internal/endtoend/testdata/emit_pointers_for_null_types_enum/postgresql/pgx/v5/query.sql

@@ -6,8 +6,8 @@
       "engine": "postgresql",
       "sql_package": "pgx/v5",
       "name": "querytest",
-      "schema": "sql/",
-      "queries": "sql/",
+      "schema": "schema.sql",
+      "queries": "query.sql",
       "emit_pointers_for_null_types": true
     }
   ]