Changes to Get metrics ready state

changed the pattern of the query request parameter date from ^(\d{4})-(\d{2})-(\d{2})$ to ^\d{4}-\d{2}-\d{2}$

added the non-success response with the status 400

added the non-success response with the status 401

added the non-success response with the status 403

added the non-success response with the status 404

added the non-success response with the status 429

the response property conversion_metrics_ready became required for the status 200

the response property non_conversion_metrics_ready became required for the status 200

endpoint added