s3.fileName does not support folders

[greg-anetac]

Whenever I try submitting a job with a path in "s3.fileName", I get an error like this

{"error":"Bad parameters","status":400,"object":["248 : File name has bad format"]}

Here is sample query request with redacted details:

{
  "query": "[redacted]",
  "from": "5m",
  "to": "now",
  "mode": {
    "type": "json/simple"
  },
  "destination": {
    "type": "s3",
    "params": {
      "aws.bucket": "[redacted]",
      "aws.region": "us-east-2",
      "aws.accesskey": "[redacted]",
      "aws.secretkey": "[redacted]",
      "format": "gzip",
      "s3.fileName":"datadrop/devo_20250131004128"
    }
  }
}

I would expect that forward slashes in S3 file name should be accepted in order to be able to put files into specific folders. Without this, Devo always writes to the root of the bucket, which is a problem.