Changes to Test A Webhook Url

added the new job_closed enum value to the request property event_type/anyOf[subschema #1: WebhookEventType]

removed the enum value company_new of the request property event_type

removed the enum value job_new of the request property event_type

the event_type request property type changed from string to no type

added the new optional request property secret

added the new optional request property webhook_id

added WebhookEventType subschema #2 to the event_type request property anyOf list

the request property event_type became optional

the request property url became optional

request property url list-of-types was widened by adding types null to media type application/json

the url request property's minLength was decreased from 1 to 0

added the optional property signature to the response with the 200 status

endpoint added