Changes to Start a training run

added the required property error_code to the response with the 401 status

added the required property error_code to the response with the 403 status

added the required property error_code to the response with the 404 status

added the required property error_code to the response with the 409 status

added the required property error_code to the response with the 422 status

added the required property error_code to the response with the 429 status

added the required property error_code to the response with the 500 status

the endpoint scheme security serviceAccount was added to the API

the security scope reference_sets:write was removed from the endpoint's security scheme oauth2

the endpoint scheme security bearerAuth was added to the API

the endpoint scheme security oauth2 was added to the API

added the new optional request property webhook

added the optional property expected_events to the response with the 202 status