Serv3 rework content changes (#7145)

Content.Shared/Chemistry/Reaction/ReactiveComponent.cs

@@ -37,7 +37,8 @@ public sealed class ReactiveReagentEffectEntry
 
     [DataField("effects", required: true)]
     public List<ReagentEffect> Effects = default!;
-    [DataField("groups", required: true, readOnly: true, serverOnly: true,
+
+    [DataField("groups", readOnly: true, serverOnly: true,
         customTypeSerializer:typeof(PrototypeIdDictionarySerializer<HashSet<ReactionMethod>, ReactiveGroupPrototype>))]
     public Dictionary<string, HashSet<ReactionMethod>> ReactiveGroups { get; } = default!;
 }