Read timezone for Crons monitors from `celery_schedule` if existing #2071

Job	Run time
loguru, python 3.5, ubuntu-20.04	1m 25s
loguru, python 3.6, ubuntu-20.04	2m 4s
loguru, python 3.7, ubuntu-20.04	1m 31s
loguru, python 3.8, ubuntu-20.04	1m 16s
loguru, python 3.9, ubuntu-20.04	1m 13s
loguru, python 3.10, ubuntu-20.04	1m 36s
loguru, python 3.11, ubuntu-20.04	1m 28s
loguru, python 3.12, ubuntu-20.04	2m 26s
All loguru tests passed or skipped	1s
	13m 0s

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