Changes to Health Check

added the new degraded enum value to the status response property for the response status 200

added the new degraded enum value to the workers/additionalProperties/status response property for the response status 200

added the new degraded enum value to the workers/additionalProperties/status response property for the response status 503

added the optional property workers/additionalProperties/reason to the response with the 200 status

added the optional property workers/additionalProperties/reason to the response with the 503 status

added the optional property workers/additionalProperties/since to the response with the 200 status

added the optional property workers/additionalProperties/since to the response with the 503 status

removed the media type text/plain for the response with the status 200

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

added the non-success response with the status 503

endpoint added