Fix Fake bench data type

[yangw-dev]

Fix bug to upload error benchmark report: benchmakr_values:[0]
Unable to see the failure report in clickhouse, wonder if bc this

[pytorch-bot]

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[huydhn]

LGTM! I have made the same mistake before using a value instead of a list for benchmark_values. Let's add a check in the upload script to throw an error so that this will fail on CI instead.