feat: Use secure random tokens for authentication and password handling in tests

tests/test_scenario_validation.py

@@ -1,5 +1,6 @@
 from __future__ import annotations
 
+import secrets
 from datetime import date
 from collections.abc import Iterator
 from typing import cast
@@ -176,8 +177,11 @@ def api_client(session_factory) -> Iterator[TestClient]:
         user = uow.users.get(user.id, with_roles=True)
 
     def _override_auth_session(request: Request) -> AuthSession:
-        session = AuthSession(tokens=SessionTokens(
-            access_token="test", refresh_token="test"))
+        tokens = SessionTokens(
+            access_token=secrets.token_urlsafe(16),
+            refresh_token=secrets.token_urlsafe(16),
+        )
+        session = AuthSession(tokens=tokens)
         session.user = user
         request.state.auth_session = session
         return session