flows: planner error handling (#4812)

* handle FlowNonApplicableException everywhere

Signed-off-by: Jens Langhammer <jens@goauthentik.io>

* make flow planner check authentication when no pending user is in planning context

Signed-off-by: Jens Langhammer <jens@goauthentik.io>

* add mailhog to e2e test services, remove local docker requirement

Signed-off-by: Jens Langhammer <jens@goauthentik.io>

---------

Signed-off-by: Jens Langhammer <jens@goauthentik.io>

tests/e2e/test_flows_enroll.py

@@ -1,11 +1,7 @@
 """Test Enroll flow"""
-from sys import platform
 from time import sleep
-from typing import Any, Optional
-from unittest.case import skipUnless
 
 from django.test import override_settings
-from docker.types import Healthcheck
 from selenium.webdriver.common.by import By
 from selenium.webdriver.support import expected_conditions as ec
 from selenium.webdriver.support.wait import WebDriverWait
@@ -17,23 +13,9 @@ from authentik.stages.identification.models import IdentificationStage
 from tests.e2e.utils import SeleniumTestCase, retry
 
 
-@skipUnless(platform.startswith("linux"), "requires local docker")
 class TestFlowsEnroll(SeleniumTestCase):
     """Test Enroll flow"""
 
-    def get_container_specs(self) -> Optional[dict[str, Any]]:
-        return {
-            "image": "mailhog/mailhog:v1.0.1",
-            "detach": True,
-            "network_mode": "host",
-            "auto_remove": True,
-            "healthcheck": Healthcheck(
-                test=["CMD", "wget", "--spider", "http://localhost:8025"],
-                interval=5 * 100 * 1000000,
-                start_period=1 * 100 * 1000000,
-            ),
-        }
-
     @retry()
     @apply_blueprint(
         "default/flow-default-authentication-flow.yaml",