Changes to Delete an agent chat attachment

the error response's property type changed from string to object for status 400

for the path request parameter recordId, the maxLength was set to 256

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

added the media type application/json for the response with the status 403

added the non-success response with the status 404

added the non-success response with the status 500

added the optional property error/metadata to the response with the 400 status

added the optional property error/requestId to the response with the 400 status

added the required property error/code to the response with the 400 status

added the required property error/message to the response with the 400 status