FScriptMapHelper::HasKey() and FScriptSetHelper::HasElement() fail on new keys with a substring of another key

Duplicate key checking in maps and sets in the editor is done via calls to FScriptMapHelper::HasKey() and FScriptSetHelper::HasElement(), but this code is checking for object names which are subsets of existing keys, and so incorrectly reports duplicate keys when adding such a new key.

This is fundamentally an editor issue rather than a Core issue. These two functions are inappropriate for these helpers and should be relocated to the editor as part of any fix.

• Create a new project
• Add some new classes:

  UCLASS()
  class AMyActor : public AActor
  {
  	GENERATED_BODY()
  };
  
  UCLASS()
  class AMyActor2 : public AActor
  {
  	GENERATED_BODY()
  };
  
  UCLASS()
  class AMyActorReference : public AActor
  {
  	GENERATED_BODY()
  
  		UPROPERTY(EditAnywhere, Category = "TestMap")
  		TMap<UObject*, int32> TestMap;
  };
  

• Compile and run the editor
• Add an instance of AMyActorReference.
• In the details panel, find the TestMap property.
• Add a new element. and assign the key to the AMyActor2 class.
• Add another new element. and assign the key to the AMyActor class.

Expected: Setting the key works.
Actual: A 'duplicate key' error is raised.