Changes to Copy social accounts

added the non-success response with the status 502

added the non-success response with the status 503

added the non-success response with the status 504

added the optional property items/channels/items/metadata/facebookPageId to the response with the 200 status

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

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

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

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

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