Fix flaky fetch log tests got overflowed (#30814)

src/metabase/models/permissions_group_membership.clj

@@ -74,4 +74,4 @@
     ;; If we're adding a user to the admin group, set the `:is_superuser` flag for the user to whom membership was
     ;; granted
     (when (= group_id (:id (perms-group/admin)))
-      (t2/update! 'User user_id {:is_superuser true}))))
+      (t2/update! :core_user user_id {:is_superuser true}))))

src/metabase/models/user.clj

@@ -121,7 +121,7 @@
       (cond
         (and superuser?
              (not in-admin-group?))
-        (t2/insert! PermissionsGroupMembership
+        (t2/insert! (t2/table-name PermissionsGroupMembership)
                     :group_id (u/the-id (perms-group/admin))
                     :user_id  id)
         ;; don't use [[t2/delete!]] here because that does the opposite and tries to update this user which leads to a