Instead of exiting and requiring the user to rerun the script after
changing pcapengine to SURICATA, let the script continue to the
version check and upgrade.
- Warn users that undeleted Stenographer PCAP data will be inaccessible
and never automatically cleaned up if they switch to SURICATA without
deleting it first
- Require pcapengine to be set to SURICATA before allowing upgrade,
with clear messaging when the user declines to change it
- Skip upgrade if already running Security Onion 3.x.x
- Add interactive prompts to delete Stenographer PCAP data (with double confirmation) and change pcapengine to SURICATA
- Direct users to SOC Configuration UI instead of editing pillar files directly
- Consolidate TRANSITION and STENO cases to reduce repeated code
