Inimical Gestalts don't spawn in other shards despite syncing the Celestial Scion defeat

I made a report about this when I wasn't sure if this was even intended to be a feature. Now it seems like it is given that the code in brightmarespawner.lua was changed to check for shard_wagbossinfo, meaning any shard with brightmarespawner will get that.

The issue is that brightmarespawner listens for:

inst:ListenForEvent("wagboss_defeated", OnWagbossDefeated)

To enable Inimical Gestalts, but this event only fires on the shard that the boss is defeated on.

There needs to be a listener for this net_var changing:

local _isdefeated = net_bool(inst.GUID, "shard_wagbossinfo._isdefeated", "isdefeateddirty")

And that same event should fire when it's dirty. Or make brightmarespawner listen for "master_wagbossinfoupdate", although that'd be inconsistent with how these things tend to be set up for shard syncing.

I feel like both wagboss_tracker and shard_wagbossinfo need a small pass to be more consistent with other similar setups, they both feel a bit incomplete right now (which is fine given the pending release later today, but yeah..). One thing I initially thought was weird is how only the forest world has wagboss_tracker.