Remove Static Component NetIds (#4247)

* Remove the unnecessary NetID property from ComponentState.

* Remove Component.NetworkSynchronizeExistence.

* Removed Component.NetID.

* Adds component netID automatic generation.

* Removed NetIdAttribute from serverside components with no corresponding clientside registration.

* Completely remove static NetIds.

* Renamed NetIDAttribute to NetworkedComponentAttribute.

* Add GenerateNetIds calls to client and server entry points.
Add test to make sure auto generated NetIds are identical.

* Component changes when rebasing that I am too lazy to rewrite into the branch.

Co-authored-by: Vera Aguilera Puerto <6766154+Zumorica@users.noreply.github.com>

Content.Shared/CombatMode/SharedCombatModeComponent.cs

@@ -1,17 +1,17 @@
 #nullable enable
 using System;
-using Content.Shared.NetIDs;
 using Content.Shared.Targeting;
 using Robust.Shared.GameObjects;
+using Robust.Shared.GameStates;
 using Robust.Shared.Players;
 using Robust.Shared.Serialization;
 using Robust.Shared.ViewVariables;
 
 namespace Content.Shared.CombatMode
 {
+    [NetworkedComponent()]
     public abstract class SharedCombatModeComponent : Component
     {
-        public sealed override uint? NetID => ContentNetIDs.COMBATMODE;
         public override string Name => "CombatMode";
 
         private bool _isInCombatMode;
@@ -78,7 +78,6 @@ namespace Content.Shared.CombatMode
             public TargetingZone TargetingZone { get; }
 
             public CombatModeComponentState(bool isInCombatMode, TargetingZone targetingZone)
-                : base(ContentNetIDs.COMBATMODE)
             {
                 IsInCombatMode = isInCombatMode;
                 TargetingZone = targetingZone;