docs: clarify Redis maintenance for CeleryExecutor#67393
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Closes #55215.\n\nAdds a Redis maintenance section to the CeleryExecutor docs explaining what Airflow stores in Redis when it is used as the Celery broker, how that differs from the metadata database, when cleanup is appropriate, and why Redis should not be flushed while schedulers or workers are running.\n\nValidation:\n- git diff --check -- providers/celery/docs/celery_executor.rst\n- rg -n Redis maintenance providers/celery/docs/celery_executor.rst