* MM-29033: Modify Test S3 connection to handle path prefix
When a IAM user is just allowed access to a specific path prefix,
the bucket exists test will fail because that is applicable to the entire bucket.
We modify that check to just list objects under that path prefix and return
on the first non-nil error.
Another consideration was to do a StatObject, but it is only applicable to actual
objects and not at a directory level. Path prefixes are entirely logical and depends
on the underlying implementation. Therefore, ListObjects is a better choice.
https://mattermost.atlassian.net/browse/MM-29033
* Improve logic
* tmp
* Only receive
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