Read timezone for Crons monitors from `celery_schedule` if existing #3952

Job	Run time
flask, python 3.5, ubuntu-20.04	3m 20s
flask, python 3.6, ubuntu-20.04	2m 20s
flask, python 3.7, ubuntu-20.04	3m 0s
flask, python 3.8, ubuntu-20.04	3m 43s
flask, python 3.9, ubuntu-20.04	3m 35s
flask, python 2.7, ubuntu-20.04	2m 22s
flask, python 3.10, ubuntu-20.04	1m 10s
flask, python 3.11, ubuntu-20.04	1m 4s
flask, python 3.12, ubuntu-20.04	2m 9s
All flask tests passed or skipped	1s
	22m 44s

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