Fire ServerListPingEvent for secondary motd send (fixes #8073)

[NoahvdAa]

Fixes #8073. Not sure if there should be a flag on the event indicating whether it was fired for a connected player or just someone pinging.

[molor]

there should be a flag on the event indicating whether it was fired for a connected player or just someone pinging

Maybe something like PaperServerListPingEvent#getReceiver() would be better in that case, e.g. if not null then it's fired for that connected player, otherwise it's some1 pinging

But there's already PaperServerListPingEvent#getBukkitPlayer() (mentioned in javadocs without any useful information) and idk maybe it's already can be used for that, I'm sorry in that case