Add e2e scenario for drift window and chunk_period
- Add scenario 1.8.1: two drift pipelines on frequency 1m. One has no
interval_minutes and an invalid chunk_period='hour', so it expects
interval=2, chunk_period='min' and one DRIFT_CHUNK_PERIOD_INVALID
notification. The other sets interval_minutes=60 and chunk_period='s',
and both are forwarded unchanged with no warning (SIENTIAPDE-2212).
- Add a _schedule_input helper that decodes the workflow input of a
laborious-namespace schedule.
- Reformat the ensure_namespace_search_attributes signature in
conftest.py to a single line.