Remove iptables support from Netavark as part of the Podman 6 release. Netavark will use nftables exclusively for firewall management. However, need to verify the impact on WSL (Windows Subsystem for Linux) environments before removal.

This story involves:

• Verifying iptables usage and requirements on WSL
• Removing iptables support from Netavark (if WSL compatible)
• Ensuring nftables works correctly on all supported platforms
• Updating documentation to reflect the removal of iptables
• Adding tests to validate nftables-only functionality

Reference: Podman 6 High Level Design