return error codes are not working for single shot uploads

[Tulsishah]

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I was trying to run the following retry_test:

curl -X POST "http://localhost:5000/retry_test" -H 'Content-Type: application/json' -d '{"instructions":{"storage.objects.insert": ["return-503-after-3072K"]},"resources": ["BUCKET", "OBJECT"]}'

I observed that the error only occurred when uploading data larger than the chunk size (e.g., during resumable uploads). When uploading data smaller than the chunk size, the error did not happen.