feat(susie_finemapper): allow for extraction of the log file from manifest

[project-defiant]

✨ Context

After successful run of ukb_ppp_eur finemapping we spotted, that the finemapping logs were saved along with the finemapping outputs - see thread.

This is not ideal and requires moving the logs after the finemapping is finished, which due to the number of files, takes significant amount of time ~30 minutes of GCSToGCSOperator.

To address this issue we want to save the logs into a separate directory.

🛠 What does this PR implement

• infer log path from the manifest directly, when the log_path column is available in the manifest.

🙈 Missing

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