Changes to Remove Handler

api operation id post_webhook_remove_handler was added

added the media type application/json for the response with the status 200

added the media type application/json for the response with the status 400

added the media type application/json for the response with the status 401

added the non-success response with the status 403

added the non-success response with the status 429

added the non-success response with the status 500

the request property _id became required

endpoint added

api path removed without deprecation