Fetch current time zone from machine instead of UTC for Workflow Crons

[sidPhoenix17]

Discussion point:

• Should we detect timezones in frontend and then pass parameters in UTC to the backend APIs? OR
• Should we just send the timezone in the API and let backend configure crons accordingly

[hp77-creator]

imo, you should take the detail explicitly from user or provide feedback on which time their cron will run, something what Jenkins does.