Redirect STDOUT/STDIN to Network Connection in Container

Detect redirection of stdout/stdin to a network connection within a container, achieved by utilizing a variant of the dup syscall (potential reverse shell or remote code execution https://github.com/swisskyrepo/PayloadsAllTheThings/). This detection is behavior-based and may generate noise in the system, and can be adjusted using the user_known_stand_streams_redirect_activities template macro. Tuning can be performed similarly to existing detections based on process lineage or container images, and/or it can be limited to interactive tty (tty != 0).