Missing parameters file is not an error

[asherikov]

Feature request

Feature description

Missing parameters file should be treated as an error: it is easy to make a mistake (broken path, missing installation instruction, accidental removal, etc) and it is takes time to detect and localize such problems in large stacks. Currently only a warning is printed -> https://github.com/ros2/launch_ros/blob/rolling/launch_ros/launch_ros/actions/node.py#L461C26-L461C59.