NetworkManager: various OWE improvements

This PR improves Networkmanagers OWE support in multiple aspects.

• Remove possibility for downgrade attacks by enforcing OWE for Enhanced Open connection-profiles
• Distinguish OWE from OWE-TM BSS in nmcli
• Handle OWE-TM BSS as compatible to Open profile. This ensures profiles will continue to work after switching a Open BSS to OWE-TM.