make thief a subgamemode (#25740)

* add SubGamemodes comp/sys

* remove RuleChance from thief rule

* use SubGamemodes for adding thief rule instead of adding ThiefRule component to random gamemodes

* clean up thief rule prototype

* add better logging + end rule if it fails to start

* march 1st incident

* preset ops

* the dreaded

---------

Co-authored-by: deltanedas <@deltanedas:kde.org>

Content.Server/GameTicking/Rules/SubGamemodesSystem.cs

@@ -0,0 +1,17 @@
+using Content.Server.GameTicking.Rules.Components;
+using Content.Shared.Storage;
+
+namespace Content.Server.GameTicking.Rules;
+
+public sealed class SubGamemodesSystem : GameRuleSystem<SubGamemodesComponent>
+{
+    protected override void Added(EntityUid uid, SubGamemodesComponent comp, GameRuleComponent rule, GameRuleAddedEvent args)
+    {
+        var picked = EntitySpawnCollection.GetSpawns(comp.Rules, RobustRandom);
+        foreach (var id in picked)
+        {
+            Log.Info($"Starting gamerule {id} as a subgamemode of {ToPrettyString(uid):rule}");
+            GameTicker.AddGameRule(id);
+        }
+    }
+}