Support payload update in cron schedules

[bhattmanish98]

Since updating the payload is a common requirement, especially when users utilize schedules for performing actions (often for cron schedules), it is important to address this need. Currently, when we need to update the schedule payload, we must delete the existing cron and create a new one with the updated payload. Therefore, we aim to implement functionality that allows for updating the payload of existing cron schedules.