Refactor stations to properly use entity prototypes. (stationsv3) (#16570)

* Update StationSpawningSystem.cs

Web-edit to allow feeding in an existing entity.

* Update StationSpawningSystem.cs

value type moment

* Update StationSpawningSystem.cs

* Oh goddamnit this is a refactor now.

* awawawa

* aaaaaaaaaaa

* ee

* forgot records.

* no records? no records.

* What's in a name?

* Sloth forcing me to do the refactor properly smh.

* e

* optional evac in test.

* tests pls work

* awa

---------

Co-authored-by: moonheart08 <moonheart08@users.noreply.github.com>

Content.Server/Dragon/DragonSystem.Rule.cs

@@ -31,10 +31,13 @@ public sealed partial class DragonSystem
     {
         base.Started(uid, component, gameRule, args);
 
-        if (!_station.Stations.Any())
+        var eligible = EntityQuery<StationEventEligibleComponent>().Select(x => x.Owner).ToList();
+
+        if (!eligible.Any())
             return;
 
-        var station = _random.Pick(_station.Stations);
+        var station = _random.Pick(eligible);
+
         if (_station.GetLargestGrid(EntityManager.GetComponent<StationDataComponent>(station)) is not { } grid)
             return;