Add tests for permissions on catalog tables

Test that if users are assigned privileges on tables in the catalog,
these permissions are retained over updates.

test/sql/updates/setup.catalog.sql

@@ -0,0 +1,13 @@
+-- This file and its contents are licensed under the Apache License 2.0.
+-- Please see the included NOTICE for copyright information and
+-- LICENSE-APACHE for a copy of the license.
+
+-- Catalog tables are occationally rewritten as part of updates, so
+-- this is to test that privileges are maintained over updates of the
+-- extension. We could verify that other properties (e.g., comments)
+-- are maintained here as well, but this is not something we use right
+-- now.
+
+GRANT SELECT ON ALL TABLES IN SCHEMA _timescaledb_catalog TO tsdbadmin;
+GRANT SELECT ON ALL TABLES IN SCHEMA _timescaledb_config TO tsdbadmin;
+GRANT SELECT ON ALL TABLES IN SCHEMA _timescaledb_internal TO tsdbadmin;

test/sql/updates/setup.roles.sql

@@ -3,3 +3,4 @@
 -- LICENSE-APACHE for a copy of the license.
 
 CREATE ROLE cagg_user;
+CREATE USER tsdbadmin;

test/sql/updates/setup.v2.sql

@@ -2,6 +2,7 @@
 -- Please see the included NOTICE for copyright information and
 -- LICENSE-APACHE for a copy of the license.
 
+\ir setup.catalog.sql
 \ir setup.bigint.sql
 \ir setup.constraints.sql
 \ir setup.insert_bigint.v2.sql