Cloning Refactor and bugfixes (#35555)

* cloning refactor

* cleanup and fixes

* don't pick from 0

* give dwarves the correct species

* fix dna and bloodstream reagent data cloning

* don't copy helmets

* be less redundant

Content.Shared/Forensics/Components/DnaComponent.cs

@@ -9,5 +9,5 @@ namespace Content.Shared.Forensics.Components;
 public sealed partial class DnaComponent : Component
 {
     [DataField("dna"), AutoNetworkedField]
-    public string DNA = String.Empty;
+    public string? DNA;
 }