[backport release-2.17] Revert change to S3 existence checks #4371
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The is_bucket and is_object methods are now behaving different in 2.17 and returning errors when they wouldn't previously. For now we're reverting to the previous 2.16 behavior.
x-ref #4370
TYPE: BUG
DESC: Revert change to S3 is_object, is_bucket checks.