On some instances of Amazon RDS, running a SELECT against
`'information_schema.role_table_grants'` fails with a `permission denied
for relation pg_authid` error. This happens because `role_table_grants`
is a PostgreSQL view that ultimately accesses the `pg_authid` table.

The PostgreSQL system function `has_table_privileges` doesn't actually
need a FROM clause. We can simplify the query to just call:

SELECT has_table_privilege('projects', 'TRIGGER')

Closes https://gitlab.com/gitlab-org/gitlab/issues/199468