Override configurations in ElementsWorker.configure and DatasetWorker.configure

Workers that support a model version configuration or a user configuration always use these to override their config attribute. To avoid doing it in every worker, this should be ported at the end of the configure methods of both ElementsWorker and DatasetWorker.

# Retrieve the model configuration
if self.model_configuration:
    self.config.update(self.model_configuration)
    logger.info("Model version configuration retrieved")

# Retrieve the user configuration
if self.user_configuration:
    self.config.update(self.user_configuration)
    logger.info("User configuration retrieved")