Fix billy nuke launches being synced to UI

[lL1l1]

Issue

An exploit that @clyfordv's mod discovered, where you can be notified of enemy billy nuke launches because the launch data is synced despite not having a VO line play.

Description of the proposed changes

Fixes the exploit by adding the VO's condition from Unit.NukeCreatedAtUnit to the launch data sync condition. Allies still get pings for billy nukes.

Testing done on the proposed changes

Log the data that is synced when a nuke launches:

• Allies/yourself/observers receive data + location data of billy nukes and nukes
• When switching to an enemy army before launching the nuke, you receive data only for nukes and no data at all for billy nukes.

Additional Context

There is currently no visual indicator for strategic launches by default, but it can be modded in.
Effectively a continuation of the anti-cheat logic in #5582.

Checklist

• Changes are annotated, including comments where useful
• Changes are documented in the changelog for the next game version

[clyfordv]

Tested, changes are good, notifications work as expected for billy and non-billy nukes.