Reapply "Logs refactoring using Go iterators (#1845)"

[lionello]

Description

This reverts commit 0ebd3d7, reapplying #1845

Linked Issues

Need to check the AWS/GCP issues that happened in MVP deployment here: https://github.com/DefangLabs/defang-mvp/actions/runs/22189428489

Checklist

• I have performed a self-review of my code
• I have added appropriate tests
• I have updated the Defang CLI docs and/or README to reflect my changes, if necessary

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[jordanstephens]

For the record, I just confirmed that @edw-defang 's fix here resolved the issue I saw earlier this week when deploying to GCP