bug: iot CreateThing does not respond correctly for when thing exists and the input requested for a different thing type.

[jay-juch-simplisafe]

Is there an existing issue for this?

• I have searched the existing issues

Current Behavior

It responds with with a success.

Expected Behavior

It should be responding with a ResourceAlreadyExistsException error.

How are you starting LocalStack?

With a docker-compose file

Steps To Reproduce

1. Create a thing with ThingType of "a"
2. Create a thing again with the same ThingName but different ThingType, ie "b".

AWS responds with ResourceAlreadyExistsException.
Localstack succeeds.

Environment

- OS:
- LocalStack:

Anything else?

No response

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