Those extensions don't support building with PostgreSQL 18, yet.
To make sure the broken status is updated on the next upgrade, they all
have version checks in the form of an evaluation warning, so that there
has be explicit action regarding its PG18 compatibility.
This is for consistency with postgresqlTestExtension and
postgresqlTestHook. Everything that is passed via postgresql's
generic.nix "packages scope" now is prefixed with "postgresql".