clan-cli tests: remove dynamic inclusion of helpers module

Dynamically extending the python path at runtime is bad for developer experience, as this is not understood by the text editor and therefore jump to definition etc. does not work.

-> Better to remove the dynamic inclusion and force developers to specify the import correctly.

pkgs/clan-cli/tests/test_secrets_generate.py

@@ -2,9 +2,9 @@ import ipaddress
 from typing import TYPE_CHECKING
 
 import pytest
-from cli import Cli
 from fixtures_flakes import FlakeForTest
-from validator import is_valid_age_key, is_valid_ssh_key
+from helpers.cli import Cli
+from helpers.validator import is_valid_age_key, is_valid_ssh_key
 
 from clan_cli.clan_uri import FlakeId
 from clan_cli.facts.secret_modules.sops import SecretStore