Cleanup subdermal implant code (#39755)

Content.Shared/Implants/Components/ReplacementImplantComponent.cs

@@ -0,0 +1,18 @@
+using Content.Shared.Whitelist;
+using Robust.Shared.GameStates;
+
+namespace Content.Shared.Implants.Components;
+
+/// <summary>
+/// Added to implants with the see <see cref="SubdermalImplantComponent"/>.
+/// When implanted it will cause other implants in the whitelist to be deleted and thus replaced.
+/// </summary>
+[RegisterComponent, NetworkedComponent]
+public sealed partial class ReplacementImplantComponent : Component
+{
+    /// <summary>
+    /// Whitelist for which implants to delete.
+    /// </summary>
+    [DataField(required: true)]
+    public EntityWhitelist Whitelist = new();
+}