Export-service is rejecting CSV file uploads with HTTP 413 errors when files exceed approximately 10-15MB, but the current MAX_PAYLOAD_SIZE configuration shows inconsistent behavior.

Problem Details:

CSV files of ~13.9MB are successfully received by export-service
Upload fails during S3 storage with error: "failed to upload tarfile to s3: read upload data failed: http: request body too large"
HTTP 413 "Request Entity Too Large" returned to client

Log:

{"level":"error","@timestamp":"2025-07-22T07:14:20.5332Z","caller":"s3/compress.go:297","msg":"failed to upload tarfile `18939572/e56983ba-6340-4cef-bf8d-1a838a1526c3/fff06698-e8e7-4df0-8411-b9e8c1a80914.csv` to s3: read upload data failed: http: request body too large"}

Attached complete log file: export-service-service-6cb858d5bc-zwqnw_export-service-service.log

Proposed fix: https://github.com/RedHatInsights/export-service-go/pull/256