Error: parameter 'start_type_description_service' has already been declared

[roncapat]

rclcpp support the parameter start_type_description_service to disable /get_type_description service; see REP-2016.

However, diagnostic_aggregator::Aggregator complains when the parameter is set.

terminate called after throwing an instance of 'rclcpp::exceptions::ParameterAlreadyDeclaredException'
what():  parameter 'start_type_description_service' has already been declared

this happens both when set via YAML file or via NodeOptions parameter overrides.

[roncapat]

Closed, since the root cause has been identified in ros2/rclcpp#2892