Brian Pandola f96ac40fca
Fix: ApproximateArrivalTimestamp should be epoch with millisecond precision (#3764)
The Record class was already capturing a unix timestamp, but it was incorrectly
converting it to ISO format when sending back to the client.

Updating the model to return the correct timestamp necessitated a minor change
to one of the tests because `botocore` converts non-timezone aware timestamps
to local time.
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