Refactor serialization copying to use source generators (#19412)

Content.Server/Labels/Label/Components/HandLabelerComponent.cs

@@ -3,7 +3,7 @@ using Content.Shared.Whitelist;
 namespace Content.Server.Labels.Components
 {
     [RegisterComponent]
-    public sealed class HandLabelerComponent : Component
+    public sealed partial class HandLabelerComponent : Component
     {
         [ViewVariables(VVAccess.ReadWrite)]
         [DataField("assignedLabel")]

Content.Server/Labels/Label/Components/LabelComponent.cs

@@ -4,7 +4,7 @@ namespace Content.Server.Labels.Components
     /// Makes entities have a label in their name. Labels are normally given by <see cref="HandLabelerComponent"/>
     /// </summary>
     [RegisterComponent]
-    public sealed class LabelComponent : Component
+    public sealed partial class LabelComponent : Component
     {
         /// <summary>
         /// The actual text in the label

Content.Server/Labels/Label/Components/PaperLabelComponent.cs

@@ -6,7 +6,7 @@ namespace Content.Server.Labels.Components
     ///     This component allows you to attach and remove a piece of paper to an entity.
     /// </summary>
     [RegisterComponent]
-    public sealed class PaperLabelComponent : Component
+    public sealed partial class PaperLabelComponent : Component
     {
         [DataField("labelSlot")]
         public ItemSlot LabelSlot = new();