Run ruff to fix test errors (#10398)

This is mostly removing unused imports, plus one unused `import as`. Had
to put back imports being used with `eval` -- see the second commit.

certbot-dns-linode/setup.py

@@ -1,5 +1,4 @@
 import os
-import sys
 
 from setuptools import find_packages
 from setuptools import setup

certbot-dns-linode/src/certbot_dns_linode/_internal/tests/dns_linode_test.py

@@ -1,12 +1,10 @@
 """Tests for certbot_dns_linode._internal.dns_linode."""
 
 import sys
-import unittest
 from unittest import mock
 
 import pytest
 
-from certbot import errors
 from certbot.compat import os
 from certbot.plugins import dns_test_common
 from certbot.plugins import dns_test_common_lexicon