dragon refactor, objectives and use GenericAntag (#20201)

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

Content.Server/Roles/RoleSystem.cs

@@ -9,6 +9,7 @@ public sealed class RoleSystem : SharedRoleSystem
         // TODO make roles entities
         base.Initialize();
 
+        SubscribeAntagEvents<DragonRoleComponent>();
         SubscribeAntagEvents<InitialInfectedRoleComponent>();
         SubscribeAntagEvents<NinjaRoleComponent>();
         SubscribeAntagEvents<NukeopsRoleComponent>();