Add attribute to camel aws SNS assertions

[jaydeluca]

#14035 added a new aws attribute, which are emitted by the camel tests. This SNS test is disabled, so our automation didn't pick up on the failure.

It was failing with:

java.lang.AssertionError: [span [SNS.CreateTopic] attribute keys] 
Expecting actual:
  [aws.agent,
    aws.request_id,
    aws.sns.topic.arn,
    http.request.method,
    http.response.status_code,
    network.protocol.version,
    rpc.method,
    rpc.service,
    rpc.system,
    server.address,
    url.full]
to contain exactly in any order:
  [aws.agent,
    url.full,
    rpc.system,
    aws.request_id,
    server.address,
    rpc.service,
    http.response.status_code,
    http.request.method,
    rpc.method,
    network.protocol.version]
but the following elements were unexpected:
  [aws.sns.topic.arn]

Now passes locally: