Rewrite previous commit's test for TestUpgradeXversion compatibility.

Rewrite previous commit's test for TestUpgradeXversion compatibility.

v17 introduced the MAINTAIN ON TABLES privilege.  That changed the
applicable "baseacls" reaching buildACLCommands().  That yielded
spurious TestUpgradeXversion diffs.  Change to use a TYPES privilege.
Types have the same one privilege in all supported versions, so they
avoid the problem.  Per buildfarm.  Back-patch to v13, like that commit.

Discussion: https://postgr.es/m/20250823144505.88.nmisch@google.com
Backpatch-through: 13