SQL: Add more legacy helpers (#92006)

pkg/registry/apis/identity/legacy/testdata/postgres--query_users-users_uid.sql

@@ -1,7 +1,7 @@
-SELECT org_user.org_id, u.id, u.uid, u.login, u.email, u.name, 
+SELECT o.org_id, u.id, u.uid, u.login, u.email, u.name,
   u.created, u.updated, u.is_service_account, u.is_disabled, u.is_admin
-  FROM "user" as u JOIN org_user ON u.id = org_user.user_id
- WHERE org_user.org_id = 0 
+  FROM "grafana.user" as u JOIN "grafana.org_user" as o ON u.id = o.user_id
+ WHERE o.org_id = 0
    AND u.is_service_account = FALSE
    AND uid = 'abc'
  ORDER BY u.id asc