Changes to Get average peer scores for operators in a cluster

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 404

added the media type application/json for the response with the status 500

deleted the query request parameter includeOperatorStubs

removed the optional property items/avg_effectiveness from the response with the 200 status

removed the optional property items/effectiveness_percentile from the response with the 200 status

the response property items/avg_peer_score became nullable for the status 200

added the new optional query request parameter includeOperatorStubs

added the optional property items/avg_effectiveness to the response with the 200 status

added the optional property items/effectiveness_percentile to the response with the 200 status

added the optional property items/last_updated to the response with the 200 status

added the optional property items/peer_name to the response with the 200 status

added the optional property items/peer_nickname to the response with the 200 status

endpoint added