As part of the Podman 6 release, we need to remove support for CNI (Container Network Interface) plugins. CNI has been deprecated in favor of Netavark, which provides better integration and functionality for container networking.

This story involves:

• Removing CNI plugin code and dependencies from podman and c/common components
• Updating documentation to reflect the removal
• Ensuring migration path for users still using CNI plugins to Netavark
• Updating tests to remove CNI-related test cases

Reference: Podman 6 High Level Design