Fix artifact upload retries

[james-panayis]

Fix artifact upload retries

Issue: #1002

Python Version(s) Tested: Python 3.11.13

Operating System(s): Linux Ubuntu 26.04

📝 Summary

Artifact upload retries reused already-consumed file streams, causing subsequent attempts to send empty or truncated data and potentially trigger S3 BadDigest errors.

The retry handling now rewinds file-like request bodies before retrying multipart POST and file-like PUT requests.

🔍 Diagnosis

Tenacity retried the request with the same stream object, which remained positioned at EOF after the first attempt. This affected both multipart and presigned artifact upload paths.

🔄 Changes

• Rewind direct and tuple-form multipart file streams before retries.
• Rewind file-like PUT bodies before retries.
• Add regression tests covering all three request forms.

✔️ Checklist

• Unit and integration tests passing. Relevant tests pass; the full suite has unrelated nightly-server compatibility failures.
• Pre-commit hooks passing.
• Quality checks passing.