Remove dead commented S3 client code from MinioContainer and RustfsContainer

[venkateshwaracholan]

Summary

This PR removes a few outdated commented-out lines from the createS3Client() implementations in both MinioContainer and RustfsContainer.

The comments appear to be leftovers from earlier Nessie-related S3 client configuration code that is no longer used. Because they do not reflect the current implementation, they can create confusion for contributors reading the code and make the methods appear more complex than they actually are.

By removing these obsolete comments, the code becomes easier to read and maintain while keeping the implementation focused on the active logic.

Changes

• Removed obsolete commented-out S3 client configuration code from MinioContainer#createS3Client().
• Removed the same obsolete comments from RustfsContainer#createS3Client().
• No executable code was changed.
• No functional or behavioral changes were introduced.

Checklist

• 🛡️ Don't disclose security issues! (contact security@apache.org)
• 🔗 Clearly explained why the changes are needed, or linked related issues: Fixes Remove dead commented S3 client code from MinioContainer and RustfsContainer #4839
• 🧪 Added/updated tests with good coverage, or manually tested (and explained how)
• 💡 Added comments for complex logic
• 🧾 Updated CHANGELOG.md (if needed)
• 📚 Updated documentation in site/content/in-dev/unreleased (if needed)