zip: split log files (inside debug zip command) from different tenants into different folders

[ricardocrdb]

For cluster virtualization, having a distinct folder structure for different tenats in a "complete" cluster debug (without designating any tags) will make it easy to determine which logs are associated with which tenants in a cluster during troubleshooting issues. Creating a folder structure to make this easy to distinguish would be much appreciated.

ie debug/tenant as a folder structure.

Jira issue: CRDB-29687

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