Fix random unused field warnings (#29948)

* Fix random unused field warnings

Not many but it counts.

* caught

* Field

Content.Server/Antag/Components/AntagImmuneComponent.cs

@@ -1,7 +1,7 @@
 namespace Content.Server.Antag.Components;
 
 [RegisterComponent]
-public partial class AntagImmuneComponent : Component
+public sealed partial class AntagImmuneComponent : Component
 {
 
 }

Content.Server/Station/Systems/StationJobsSystem.cs

@@ -24,9 +24,9 @@ namespace Content.Server.Station.Systems;
 public sealed partial class StationJobsSystem : EntitySystem
 {
     [Dependency] private readonly IConfigurationManager _configurationManager = default!;
+    [Dependency] private readonly IPlayerManager _player = default!;
     [Dependency] private readonly IRobustRandom _random = default!;
     [Dependency] private readonly GameTicker _gameTicker = default!;
-    [Dependency] private readonly IPlayerManager _playerManager = default!;
 
     /// <inheritdoc/>
     public override void Initialize()
@@ -56,7 +56,7 @@ public sealed partial class StationJobsSystem : EntitySystem
         if (_availableJobsDirty)
         {
             _cachedAvailableJobs = GenerateJobsAvailableEvent();
-            RaiseNetworkEvent(_cachedAvailableJobs, Filter.Empty().AddPlayers(_playerManager.Sessions));
+            RaiseNetworkEvent(_cachedAvailableJobs, Filter.Empty().AddPlayers(_player.Sessions));
             _availableJobsDirty = false;
         }
     }

Content.Server/Station/Systems/StationSystem.cs

@@ -31,7 +31,6 @@ public sealed class StationSystem : EntitySystem
     [Dependency] private readonly ILogManager _logManager = default!;
     [Dependency] private readonly IPlayerManager _player = default!;
     [Dependency] private readonly ChatSystem _chatSystem = default!;
-    [Dependency] private readonly GameTicker _ticker = default!;
     [Dependency] private readonly SharedTransformSystem _transform = default!;
     [Dependency] private readonly MetaDataSystem _metaData = default!;
     [Dependency] private readonly MapSystem _map = default!;