Added employee.rehire_cancelled webhook

We've added the employee.rehire_cancelled webhook to Employee Events

employee.rehire_cancelled- This event was created to notify when an employee rehire has been cancelled.

Example Payload

{
  "event_type": "employee.rehire_cancelled",
  "resource_type": "Company",
  "resource_id": 7756341741171842,
  "resource_uuid": "5df911a0-e8e9-412d-8aaf-a46ad193dd96",
  "entity_type": "Employee",
  "entity_id": 7757869436426662,
  "entity_uuid": "bcfc9744-0ab3-4ef3-ab0d-e728255d659c",
  "timestamp": 1671058841,
  "uuid": "03ffbf0c-48a9-4f1c-932a-546413a26ad1"
}