37 event registration reminder email notification

[bmtemakina]

• After Insert Event Flow created
• Scheduled path for sending emails added.

Test Cases:

• Created an event 2 days after from now and got the emails for registered attendees.
• Created two events at the same time and got the emails for each individual.
• Updated the date/time field of the event and checked if the scheduled workflows date if it got updated.
• Created/Updated an Event in the past and checked for the scheduled workflows to not to be created.
• Tested the flow with Contact record which email field is empty.