fix GetTopicAttributes exception when arn is malformed #9310
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Motivation
As reported in #9306, we would raise a 500 when the topic is not a properly formed ARN. This exception comes from moto, and should be handled there as well. In the meantime, we can fix it with our utils.
Changes
Moved up our method to get the topic, which will raise the proper exception if there's an issue before calling moto. Added a test with a malformed arn to validated the behaviour.