Read timezone for Crons monitors from `celery_schedule` if existing #3961

Job	Run time
celery, python 2.7, ubuntu-20.04	3m 37s
celery, python 3.5, ubuntu-20.04	2m 31s
celery, python 3.6, ubuntu-20.04	2m 53s
celery, python 3.7, ubuntu-20.04	4m 31s
celery, python 3.8, ubuntu-20.04	3m 10s
celery, python 3.9, ubuntu-20.04	1m 59s
celery, python 3.10, ubuntu-20.04	1m 56s
celery, python 3.11, ubuntu-20.04	1m 22s
All celery tests passed or skipped	1s
	22m 0s

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