De-duplicate loadout gear (#30341)

* De-duplicate loadout gear

Needs supporting code, probably with an interface with StartingGearPrototype which would also use it, but I regexed the yaml.

* Code updates

* Remaining yaml

* Fix automatic naming

* raiseEvent

* Don't code when tired kids

Content.Shared/Roles/JobPrototype.cs

@@ -87,8 +87,8 @@ namespace Content.Shared.Roles
         [DataField("antagAdvantage")]
         public int AntagAdvantage = 0;
 
-        [DataField("startingGear", customTypeSerializer: typeof(PrototypeIdSerializer<StartingGearPrototype>))]
-        public string? StartingGear { get; private set; }
+        [DataField]
+        public ProtoId<StartingGearPrototype>? StartingGear { get; private set; }
 
         /// <summary>
         /// Use this to spawn in as a non-humanoid (borg, test subject, etc.)